When: 2015-07-10

Collection location: Petenwell Rock, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available


Proposed Names

29% (1)
Recognized by sight
93% (3)
Recognized by sight: substrate HCl-, thallus endolithic
Based on microscopic features: epihymenium dark purplish-brown, hymenium clear, hypothecium hyaline, ascus lecidella-type, spores 8 per ascus ~16×7.5µm

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= Observer’s choice
= Current consensus


Add Comment
By: Jim Bennett (Lichenman)
2017-02-15 14:30:00 CST (-0500)

I checked the spores and they are 13-6, ellipsoid, the epihymenium is black and the hypothecium is blue-green. I thought this might be Sarcognyne privigna but the spores are definitely Lecidella. The growth in a cylinder of sandstone is very unusual.

Jason, thi is #7102015-1, which you already know.
By: Andrew Khitsun (Andrew)
2016-01-17 11:29:42 CST (-0500)

There was no way for me to preserve thallus because, as you can see, it resides on these sandstone “stumps” that fall apart when disturbed. I can’t figure out whether it was lichen that held the whole thing together, since I didn’t see any thallus to speak of that would tie the sand grains together.

This looked like a tree stump from afar.
By: Andrew Khitsun (Andrew)
2015-07-13 22:02:28 CDT (-0400)

But it turned out to be just a “butte” made out of sandstone rising above otherwise flattish angled surface of a road cut (it goes at slight angle where this thing was, before rising in more vertical manner). When I tried to take a sample of the lichen from it – it collapsed. There was another, partially collapsed one next to it, and some up the slope where I couldn’t reach them. Some of the same lichen (or so it seems) just grows flat on the surface of the sandstone.