Collection location: Wyalusing State Park, Grant Co., Wisconsin, USA [Click for map]
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Fingers crossed! :)
I personally rely almost entirely on a microscopic feature to identify L. muralis s. str. these days. (Chemistry and color and shape are so variable.) L. muralis (and to a lesser extent L. semitensis, but it scarcely has radiating marginal lobes and has a distinctive “black outline”) seems to be the only species in the whole group which has a jagged, interrupted algal layer.
You can kind of see it even under a dissecting scope sometimes if you have a nice fresh sharp razor blade and can get a super-thin longitudinal section of one of the lobes. But if you don’t see the jags doing this, it still doesn’t mean you won’t see them under a compound scope, so it’s only a useful test as a positive verification (sometimes) of L. muralis, not as proof that you have L. valesiaca. Far from. :(
This may end up being the same again. But it stands apart from “normal” L.muralis. It’s very small – all the bodies pictured here are not bigger than half inch. Also, it’s in very exposed locations (I call it super-exposed – usually high on the open bluffs facing Mississippi valley), while L.muralis usually prefers partial shade around here. These thalli are on bird perch rocks where turkey vultures rest. But I can’t say if it has prunina or not – at magnification available to me the thallus just looks white. The whole thing is so “bleached” that it’s difficult to photograph.
Created: 2015-04-18 03:12:27 BST (+0100)
Last modified: 2015-04-18 03:29:40 BST (+0100)
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