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Posts Tagged ‘Peppered Rock Shield Lichen’

As the leaves fall there is much revealed in the forest that was hidden just a short time ago, and lichens are a big part of that revelation. Lichens are all around us but they’re one of those things that are so easy to miss unless we happen to be looking for them. Most people seeing this photo would probably say “Oh yes, I see lichens all over the stones in the stone wall.” But what about the tree? That’s a shagbark hickory tree and they have gray, not white bark. The white is a lichen called, appropriately enough, whitewash lichen (Phlyctis argena.) This lichen is usually found on the bark of hardwood trees and is fairly common. It makes the tree look as if it has been painted white, and that’s where its common name comes from. They can be greenish white, silvery, or bright white.

But you wouldn’t have been wrong in pointing out the lichens on the stone wall because it is covered with them, among them rock greenshield lichens (Flavoparmelia baltimorensis.) This lichen always looks like melted candle wax to me. It is very common in this area and is another of those bits of nature that you see so often they no longer register.

Peppered rock shield lichen (Xanthoparmelia conspersa) likes to grow on stone in full sun and I find a lot of them on stone walls like the one pictured in that first photo. They’re a good introduction to lichen study because their brown apothecia, where their spores are produced, are large and easy to see without aid. Lichens are made up of a symbiotic relationship between fungi and algae or cyanobacteria. Technically apothecia are “fungal reproductive structures, in which the fungus reproduces itself through the production of spores” This is not the only way that lichens reproduce, but it is common and the apothecia are often beautiful and well worth watching for.

Another lichen common to stone walls is the sulfur dust lichen (Chrysothrix chlorina.) It’s very yellow and hides under overhangs so it doesn’t get rained on. At least I think that’s why I always find it tucked away like this, but this is odd behavior for a lichen because they usually like a lot of rain and sunshine.

Sulfur dust lichens are kind of granular in texture. If you’re lucky you can sometimes find them with fruiting bodies (apothecia) but more often than not I see them when they aren’t producing spores, like this example.

If you spend time walking along old stone walls eventually you’ll see a stone with a splash of bright orange on it and it will probably be the sidewalk firedot lichen (Caloplaca feracissima,) so called because it is a lime lover and grows on concrete sidewalks, which have lime in them. When you see it in a stone wall it’s a fair bet that the stone it grows on has limestone in it too. This stone looks like granite to me but it is almost completely covered by it.

A closer look at this example of the sidewalk firedot lichen showed it was made up of mostly irregularly shaped fruiting bodies, so it was making plenty of spores. It was raining just a short while before I took this photo so it was also still wet. Lichens are at their best when they are wet because that’s when they’ll show their true colors and size, so that’s when serious lichen hunters look for them. A misty or drizzly day is perfect.

I know of an old stump that has more British soldier lichens (Cladonia cristatella) growing on it than I’ve ever seen in one place. Old rotted logs and stumps are the perfect places to find them and their bright red color makes them relatively easy to spot.

Even I can see this shade of red, and I’m colorblind.

If you see a tree with growths like this on it you really should take a closer look, because there are some amazing things going on here.

One of the things going on in the tree in the previous photo is what is happening on this star rosette lichen (Physcia stellaris.) Its apothecia are a good example of how colors can change, even on the same lichen. This lichen has dark brown apothecia that are often pruinose. Pruinose refers to the white, waxy, powdery coating on the apothecia. You’ve no doubt seen examples of this waxy “bloom” on blueberries and plums. I’ve noticed by watching lichens that have pruinose apothecia that the coating can reflect light in different ways, sometimes appearing gray and at other times more blue, and sometimes even black. The apothecia on this lichen show a range of colors, from brown to light blue. The way the sunlight strikes it has a lot to do with its colors, so sometimes you have to visit a lichen more than once to understand it.

Common goldspeck lichens (Candelariella vitellina) are uncommonly beautiful. Look for this bright yellow crustose lichen on stone, in this case slate. It’s a very artistic lichen and I like the patterns that it makes. I see it on gravestones quite often. It shouldn’t come as a great surprise that, at high magnification, the body of the common goldspeck lichen looks like it’s made up of tiny golden specks. The book Lichens of North America describes the body of this lichen as “little cushions of flattened granules.” This lichen is sometimes sterile, with no fruiting bodies present, as this one appeared to be. Crustose lichens form crusts that tightly adhere to the substrate that they grow on and usually can’t be removed without damaging it.

The golden moonglow lichens (Dimelaena oreina) that I see are usually about an inch across but they can get much bigger. They grow in full sun on granite and don’t seem to change color when they dry out like many other lichens do. The bigger one in the photo was producing spores and that’s something I don’t see this lichen do very often. If you spend much time in cemeteries you have probably seen this pretty lichen, because it seems to like growing on smooth, polished stone, especially granite. It is a another crustose lichen, so removing it from a gravestone would be a challenge. When lichens grow on glass the acids in them can actually etch the glass and this is a problem in the big European cathedrals, especially. I would think the same would be true for polished stone.

Bright yellow-orange poplar sunburst (Xanthomendoza hasseana) is a beautiful lichen with its large disc shaped, sucker like fruiting bodies (apothecia) which are almost always showing. It’s found on tree bark and provides a lot of color in winter when there are no flowers to see. The example shown here was about as big as a penny, or about .75 inches across.

Another sunburst lichen, the elegant sunburst (Xanthoria elegans) was exposed to ultraviolet radiation, cosmic radiation, and the vacuum of space for one and a half years and when it was brought back to earth it grew on as if nothing had happened. Many believe that lichens are virtually indestructible and are therefore as close to immortal as any earth based life form can be.

Pink earth lichen (Dibaeis baeomyces) closely resembles bubblegum lichen (Icmadophila ericetorum.) One of the differences between the two is the length of the stalks that the plump pink apothecia sit on. They are longer on bubblegum lichens than they are on pink earth lichens. Both are very beautiful things that are rarely seen in this area. The whitish or grayish thallus, or body of the lichen, grows on soil; usually on dry acidic soil near blueberry and sweet fern plants. It can sometimes have a bluish cast as well.

Here’s a closer look at the apothecia on the pink earth lichen. You can also see the stalks that support them.

Scattered rock posy lichens (Rhizoplaca subdiscrepans) can be quite small and difficult to see without magnification, but it’s worth looking for them because they almost always have their bright orange apothecia showing. They like to grow on stone, especially granite, in full sun. They don’t seem to change their color when they dry out like many other lichens do. I’ve seen this pretty lichen even on mountain tops.

Some lichens are very easy to identify because there aren’t many others that look like them, and the toadskin lichen is one of those. Toadskin lichens show color changes like many other lichens. When wet it is pliable and pea green and when dry it becomes crisp and ash gray. This example hadn’t completely dried out but it was on its way, even though it had rained that morning. Toadskin lichens get their common name from their many “warts.” They attach themselves to stone at a single point that looks like a belly button, and that makes them an umbilicate lichen. This toadskin is very special, because it is the only one I’ve ever seen that wasn’t on a hill or mountain top. It grows on a boulder at the very water’s edge of a lake and I’m very happy that I found it now that hill climbing is getting more difficult. Now at least I’ll still be able to see these beautiful little things without having to struggle to reach them, if it comes to that.

Smokey eye boulder lichens (Porpidia albocaerulescens) are one of the most beautiful in my opinion, but their beauty is fleeting and it depends on how the light happens to fall on them. If you find one it might not look like this one at all. The pretty golden brown body (thallus) of the lichen is peppered with blue apothecia which again, are colored by the light. Take a look at the next photo to see what a simple change in light can do.

This is the exact same lichen we saw in the previous photo; all that is different is the light, and that’s why if you’re at all interested in lichens you really should visit them at different times of year, as I said when we looked at the star rosette lichen. The previous photo was taken when sunlight was falling on it, and this shot was taken when the lichen was in shade. Not only light but dryness can affect the color of many lichens, so make a note of where you find them and then go back when the weather has changed. I think you’ll be amazed by how much they can change, and also by how beautiful they can be.

There is a low mist in the woods—it is a good day to study lichens. ~Henry David Thoreau

Thanks for coming by.

 

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Two of my great loves are history and botany and one of the best ways I know of to get a good dose of both is by following stone walls. This particular wall is in Swanzey, New Hampshire and surrounds what I believe is the oldest cemetery in town. Revolutionary war soldiers are buried here so it certainly has some age.

Right off I spotted some sulfur dust lichen (Chrysothrix chlorina.) It’s very yellow and hides under overhangs so it doesn’t get rained on. At least I think that’s why I always find it tucked away like this, but this is odd behavior for a lichen because they usually like a lot of rain and sunshine.

Sulfur dust lichens are kind of granular in texture. If you’re lucky you can sometimes find them with fruiting bodies (apothecia) but more often than not I see them when they aren’t producing spores.

There are stone walls called “lace walls” which are built of a stack of stones just one stone wide, and which are full of holes that make them look like lace, but this is a tossed wall sometimes three or four stones wide and it was built to keep animals, probably sheep, out. There were no holes when it was built but there are now, as this photo shows. I can’t explain how it happened but I’ve built enough dry stone walls to know that building a hole like this one into a tossed wall would be close to impossible. In a tossed wall the stones are literally just tossed on top of one another. The object wasn’t to build a pretty wall; it was to get rid of the stones as quickly and efficiently as possible. I think a stone must have fallen or been taken out of the wall to create such a hole.

There are a lot of tree stumps along the wall and some of them, like the one above, are very old. Not only was this one covered with moss and lichens, it also had birch trees growing out of it. Stumps like this are always worth a second look.

The old stump had more British soldier lichens (Cladonia cristatella) growing on it than I’ve ever seen in one place. Old rotted logs and stumps are the perfect spots to find them.

Even I can see this shade of red, and I’m colorblind.

A large pile of sand at the base of another hollow tree stump meant that something was living under it. Possibly a ground hog, but I didn’t see a single paw print.

This old maple tree was covered on its sunny side by whitewash lichen (Phlyctis argena.) This is a tough, crusty lichen that is fairly common on hardwood tree bark. They can cover quite a large area and make the tree look as if it has been painted, hence the common name. They can be greenish white, silvery, or bright white.

As time passed barbed wire was often added to stone walls to keep animals in or out. Stone walls were usually too low to be effective and cows and other farm animals often jumped right over them, so their height was increased by adding wire or other materials. You had to pay a fine if your animals escaped and were caught roaming free. They were brought to the town pound and the owner had to pay to get them back. This wire grew out of the very center of a pine tree, so it has been here for quite a while. Running their saw into steel wire is one of a wood cutter’s worst nightmares come true but many things have been found inside trees, from axe heads to gravestones to even bicycles.

Every time I see rusty old barbed wire stapled to a tree I think about a book I read by a man who lived in a cabin in the Massachusetts woods. He said that one of his favorite things to do was run through the woods at night. He wouldn’t want to do that here. I wouldn’t even run through these woods in broad daylight because much of what is now forest was once pasture, and there is a lot of barbed wire out there.

Peppered rock shield lichen (Xanthoparmelia conspersa) likes to grow on stone in full sun and I find a lot of them on stone walls. They’re a good introduction to lichen study because their brown apothecia, where their spores are produced, are large and easy to see without aid.

Scattered rock posy lichens (Rhizoplaca subdiscrepans) on the other hand, are quite small and difficult to see without magnification, but it’s worth looking for them because they almost always have their bright orange apothecia showing. They like to grow on stone, especially granite, in full sun. They don’t seem to change their color when they dry out like many other lichens do.

Sometimes it isn’t what is on the stone that interests me, it’s the stone itself. I’m not sure if this pattern was on the stone or part of it but it was very interesting. Also interesting was how it had absolutely nothing growing on it when all of the stones around it had mosses and lichens growing on them.

I never knew my grandfather but I do know that he made his living as the town blacksmith in Westmoreland, New Hampshire, and this old horse hitching ring brought thoughts of him to mind. If he was lucky a blacksmith might make a dollar a day but very little cash changed hands in colonial America so he most likely would have been paid in food, charcoal for the forge, lumber, or something else he needed. In the early 1800s blacksmiths charged anywhere from 2 cents for an axe wedge to $5.50 for all of the ironwork on a new wagon. That would include springs, axles, brakes, and rims for the wheels. I have a photo of my grandfather working on a wagon wheel in his blacksmith shop. The wheel sits on top of a big wooden keg that he probably made the iron hoops for. I hope he was paid more than they were in colonial times.

Some of the stones in this old wall are not natural, meaning they were cut or quarried. There is a large granite outcrop just up the hill from this spot and stone was taken from it using star drills and sledge hammers, I would imagine. The marks of the old hand drills are still easily seen on some of the stones. It’s unusual to see both natural and cut stones together in a wall; usually they’re made of one or the other but the farmer could have been trying to increase the height of his walls.

Some of the quarried granite was used for fence posts. Four posts were put in around certain family plots in the cemetery and chain hooks were added by drilling a hole into the top of each post and hammering a hook into the hole.  I’m not sure if friction alone held the hooks in the holes or if cement was added to hold them, but after over 200 years they are still solid and immovable.

Once chain was added the family plot was enclosed but still visible to anyone trying to find it. This chain looks like it was hand wrought.

Blacksmiths don’t cast iron; they soften it by heating it in a forge and then shaping it with a hammer, and I love how you can see all the hammer blows on this chain hook. I also love how the smith fashioned something as simple as a chain hook into what looks like a dragon’s tail. He didn’t have to do this; it was extra work that he probably wasn’t paid for, but he was good and would have wanted people to know his work. If I needed ironwork done and I saw this hook and the ones in the previous photos I would have chosen the smith who made this one. It’s a beautiful thing which, if I owned it, would be considered a work of art.

Sometimes these posts wander in unplanned directions and almost write themselves, and this is one of those; l felt as if I were just along for the ride instead of the one doing the writing. It began in the old cemetery and I just tagged along with the camera while the story wrote itself in my mind, so I hope you won’t mind that there is a little more history than botany in this one. Though I expected the post to be full of mosses and lichens for me the history I found was a refreshing diversion while I wait for spring flowers to appear, and thoughts of my hammer wielding grandfather ran all through the day. I wonder if he ever imagined that one of his grandsons would grow up to be a stone wall builder.

Stones are all about time—time to find them, to move them, to place them, and time, occasionally, to chisel and shape them. And above all, time to see them, experience them, and fall under their spell. ~Charles McRaven

Thanks for stopping in.

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