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Posts Tagged ‘Shingled Rock Shield Lichen’

Actually stone walls can talk, but you have to speak their language to be able to decipher what they’re saying. Having built a few myself this one was relatively easy to understand. It told me that its builder didn’t have time for tight joint stone masonry and in any case most likely didn’t know how to build with stone anyway. He needed a field to plant crops in so he and his family could survive and these stones were in the way of the plow, so he tossed them in a long undulating pile, and that became what is now called a tossed or thrown wall, because the stones were literally just thrown on top of one another with no time or eye for intricacies.

The landowners on either side of the wall didn’t have time to patrol the wall and pull tree seedlings so many of them started growing down in the wall where their seeds fell. Some saplings were too close to stones to cut with an axe or saw so they grew to massive size, sometimes pushing the wall stones apart ever so slowly  to make room for the huge trunk. Now, over 250 years later they shade the wall and keep it from being covered in deep snow. Some, like the white pine shown above, still stand even after being struck by lightning. The old split in its bark runs from the top of the tree all the way down its trunk, following a root right down into the ground. I’ve found trees like this one soon after they were struck and the ground around them was covered with narrow strips of bark, blown right off the wood by the lightning bolt.

You can see many interesting things if you look at our stone walls carefully, like this blacksmith made hitching ring where someone would have hitched up a horse. The odd thing about it is its location in the wall. It’s in an empty place where it doesn’t look like there would have much going on but 250 years ago it could have been a community information hub, for all I know. Most likely it was simply a shaded place for the horse to rest while the rider did whatever they had to do here.  I’m guessing it involved a lot of work.

My grandfather was the town Blacksmith in Westmoreland which is to the north west of here, so I’m always fascinated by iron work. The chain hook shown here is one of the best examples of 18th century blacksmithing I know of. I like it because it shows hand hammered marks and shows the fine workmanship and talent of the smith. He didn’t have to make such a utilitarian object as beautiful as a dragon’s tail, but he did.

This stone in this wall is only the second place I’ve found a beard lichen growing on stone. I’ve seen thousands of beard lichens but they were growing on wood 99% of the time. I think this one might be a bushy rock lichen (Ramalina intermedia.) Lichen communities grow in succession with many varieties of crustose lichens as pioneers. Foliose lichens come next as intermediary species and finally fruticose lichens like this one are considered climax species. What I don’t know is, how much time is between pioneer and climax? Climax communities of lichens are considered “old growth” communities.

As this stone shows stone walls absorb a lot of heat from the sun and release it slowly all night long until the sun shines again the following day.

Because it’s so warm near stone walls in the winter many plants like this mullein like to grow along them. In fact there is an amazing variety of plants growing on or near this wall.

There are many ferns growing along this old wall. Some are evergreen and others, like this one, are trying to be.

Many types of trees grow along the old wall including shagbark hickory (Carya ovata) which is named, not surprisingly, for its shaggy looking bark. These trees drop large amounts of hickory nuts each fall so I thought I’d find one and show it to you.

Unfortunately the squirrels had already found all the nuts and I didn’t see a single one.

I did see a lichen on the bark of the hickory that I’ve never seen before though, made up of a grayish body (Thallus) with tiny black fruiting bodies (Apothecia.) I think it might be the tiny button lichen (Amandinea punctata) which grows on wood and has a grayish, barely perceptible thallus and flat, disk shaped, black apothecia. Each black dot seen here is very small; about the size of a period made on paper with a pencil.

At the base of the hickory was a stone with a forest of pixie cup lichens (Cladonia asahinae) on it. The tiny little golf tee shaped parts are the fruiting bodies of this lichen. Spores produced in them will be splashed out of the cup by raindrops.  Pixie cups almost always produce large groups of fruiting bodies like these.

Shield lichens have become kind of a ho-hum lichen for me because I see thousands of them, but the way this one seems to overlap like shingles and the way it grows in concentric circles is different, and I’m not so sure it’s a shield lichen at all. I’m leaning towards the zoned dust lichen (Lepraria neglecta) but I’ll have to go back and have another look to be sure. It also resembles the shingled rock shield (Xanthoparmelia somloensis.) Like any other part of nature, stone walls have their own mysteries.

Another lichen that I don’t see often is what I believe is the rosy saucer lichen (Ochrolechia trochophora) seen here. Its rosy or orange apothecia are large and pad like and I’ve read that though it usually grows on wood it can grow on stone as well. It could also be a scattered rock posy lichen but I don’t think so.

Sometime I can be fooled into thinking I’m seeing lichens when I’m really seeing something else. In this case I’m not sure what the green “something else” was but possibly algae. Why it was here in this spot and nowhere else along the wall, I’m not sure.

Common speedwell was enjoying the warmth from the wall and looked as good as it does in early June but of course it wasn’t flowering. This European native is common here and has been used medicinally for centuries. Its leaves have also been used as a tea substitute.

I think a lot of us believe that winter is a very wet season and it can be when the snow melts, but when it is cold and there isn’t any melting going on it can be very dry, and this white tipped moss (Hedwigia ciliata) reminded me of that. When dry it pulls its tiny needle like leaves in close to the stem and if dry enough it looks like strands of string or clumps of worms, and this gives it another common name of medusa moss. It hadn’t reached that point when this photo was taken but it was quite dry, even with snow on it.

Stone walls will give many gifts to those who walk slowly along their length and look closely. One of the greatest gifts they give me is green leaves in winter, even when there is snow on the ground.

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 coming by.

 

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1. Stone Walls

Whitetail deer know if they are to survive in the winter they need to follow the sun and stay on warm, south eastward facing slopes during the day. Not only is it warmer in these places, but the abundant sunshine often means quicker snow melt and plenty of browse. Quite often in winter I follow their lead and on this day I walked along an old stone wall where the overhanging white pines and eastern hemlocks made for light snow cover and the bright sunshine meant it was considerably warmer.

 2. Shingled Rock Shield Lichen aka Xanthoparmelia stenophylla

But sunshine and warmth aren’t the only reasons I come here. Lichens and mosses grow on these stones by the thousands and this old wall has become one of my favorite places to hunt for them in winter. Many of the lichens are in their fruiting stage at this time of year, as the above example of a shingled rock shield lichen (Xanthoparmelia stenophylla) shows. The dark brown, cup shaped growths are the apothecia, or fruiting bodies. These lichens have been here probably for hundreds of years because they are quite large. I’ve seen some that were the size of grapefruit.

3. Rock Greenshield Lichen aka Flavoparmelia baltimorensis

Rock Greenshield Lichens (Flavoparmelia baltimorensis) are also quite large and are very common along this stretch of stone wall. Most foliose lichens seem to prefer growing in the sunshine and these are no different. Foliose means “leaf like” but these lichens always remind me of melted candle wax. In fact there is a lichen known as the eastern candle wax lichen (Ahtiana aurescens), but it grows on tree limbs instead of stone and leans more towards gray than green.

 4. Scattered Rock Posy Lichen aka Rhizoplaca subdiscrepans

I’m going into my third year of visiting this scattered rock posy lichen and if it has changed in that time the change is imperceptible. When I first found it, it was the only one I knew of but over the years I’ve found others. It likes to grow on granite in full sun and is one of the most beautiful lichens, in my opinion. This photo is the closest I’ve ever been able to get to it. The orange disc shaped growths are its fruiting bodies and the grayish, brain like growth is the thallus, or body. The entire lichen is about the size of a penny.

 5. Orange Crust Fungus aka Stereum complicatum

Lichens weren’t the only finds here on this day. This orange, crust like fungus is a parchment fungus called, not surprisingly, orange crust fungus (Stereum complicatum). It was growing a fallen branch. The complicatum part of the scientific name means “folded back on itself.” One of the identifying characteristics of this fungus is the smooth, pore free underside.

 6. Aster Seed Heads

There were plenty of aster seed heads along the wall, waiting for hungry birds.

 7. British Soldier Lichens

British soldier lichens (Cladonia cristatella) grew on an old rotting stump. This lichen was named by someone who thought they resembled the eighteenth century uniform of a  British soldier. It’s very slow growing, and in a good year might grow 2 millimeters. The red parts of this lichen are where its spores are produced and, since they don’t make spores until they reach at least 4 years of age, I know this one has been here awhile. British soldiers and their cousins pixie cups are frutose lichens, which is a lichen that stands upright or hangs down.

8. Rusty Rod in Stone-2

Here and there in this wall there were holes drilled into the stone. In this case a steel rod was held in the hole by an old cut nail. The wire, I think, was probably used to fasten a strand or two of barbed wire to the rod. This gave the stone wall about 2 feet of extra height and probably helped keep the livestock in. Or out, if they had an enclosed vegetable garden.

 9. Hole in Stone

In some cases the rods were gone. The quarter sized holes were most likely done by hand with a star drill and sledge hammer.

10. Hedwigia cillata Moss

Hedwigia cillata moss looked good and healthy. This moss loves to grow on exposed surfaces like stones and cliff faces in sun or shade and is common all over the world. When dry this moss pulls its leaves in tight to the central stem and loses much of its bushy appearance.  Its fruiting bodies (sporophytes) are orange but hide deep among the leaves on short stalks so they aren’t as easy to see as those on other mosses.

11. Moss Covered Boulder

This boulder was covered with carpet mosses and lichens. In her book Gathering Moss author Robin Wall Kimmerer says that lichens pave the way for mosses on stones and other smooth surfaces. Lichens produce acids that slowly etch surfaces just enough to give rootless mosses enough of a purchase to anchor themselves to. The acids in lichens are powerful enough to etch even glass, and they have been known to damage stained glass in some of the great cathedrals of Europe. The yellow square in the above photo shows the area where the following macro photo of moss came from.

12. Brick Carpet Moss aka Bryoerythrophyllum recurvirostrum

This is an extreme close-up of what I believe is brick carpet moss (Bryoerythrophyllum recurvirostrum). There are many different low growing moss species that form carpets and, in my experience, are very hard to identify. These mosses seem to grow in the harshest conditions like on boulders in full sun, but mosses are tough. Robin Wall Kimmerer notes that mosses held dry in herbarium cabinets for 40 years revived in just a few minutes after being given water.

13. Common Goldspeck Lichen aka Candelariella vitellitta

Common goldspeck lichen (Candelariella vitellitta) is uncommonly beautiful. This bright yellow lichen grows on calcium free stones and the examples that I’ve found have always been quite small.  This was the first time that I’ve seen this lichen fruiting. The apothecia or fruiting bodies are disc shaped and slightly darker in color than the granular body, and are so small that I can’t think of anything to compare them to. In fact, I didn’t even see them until I looked at the photo. This one was a real test of the macro capabilities of my camera-all that you see in this photo would easily fit on a dime with room to spare.

14. Golden Moonglow Lichen

Golden moonglow lichen is another small but beautiful, greenish yellow squamulose lichen that grows on stone in full sun. The example in the photo grew on granite and was about the size of a penny, but I’ve seen them larger. This example had quite a lot of dark, disc shaped fruiting bodies showing in its center. A squamulose lichen falls somewhere between the leafy foliose lichens and crusty crustose lichens and has “squamules,” which in this case are the curled lobes around its outer edges.

There is no absolute scale of size in nature, and the small may be as important, or more so than the great. ~Oliver Heaviside

Note: I’m sorry that I don’t remember which of you told me about the Gathering Moss book, but I’d like to thank you for doing so. It’s a great book.

Thanks for coming by.

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