When: 2012-03-11

Collection location: University of Wisconsin Arboretum, Madison, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

No specimen available


Proposed Names

29% (1)
Recognized by sight
57% (1)
Recognized by sight

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Add Comment
By: Debbie Viess (amanitarita)
2012-03-12 18:52:37 PDT (-0700)

like…“having a frost-like or floury surface covering of pruina.
Often caused by calcium oxylate crystals in lichen thallus.”

Dictionary of the Fungi, 8th Edition.

Cool details! You’re making a lichenologist outta me, bit by bit!

Right on the head, Jason – Sarcogyne regularis
By: Andrew Khitsun (Andrew)
2012-03-12 18:31:27 PDT (-0700)

From “Lichens of WI” by Thomson:
1.Apothecia pruinose, on calcareous rocks…………Sarcogyne regularis
……In WI it’s scattered over the state.

Pruinose disks!
By: Jason Hollinger (jason)
2012-03-12 18:23:11 PDT (-0700)

Pruina elevates this far above the “little black dot” trashcan! :) One of the Sarcogyne typically has pruinose disks. S. regularis, I think. Most Sarcogyne also show at least some splitting along the margins, too.

Discs, not Dots!
By: Andrew Khitsun (Andrew)
2012-03-11 21:26:26 PDT (-0700)

I know I’m going to be accused of uploading yet another batch of non-descript black dots. Mind you, though, these are not dots, but little discs. And look how they reflect the sun at certain angle, asking to be IDd. These are in public place, so there is no way to collect a sample. I believe the substrate to be a dolomite.