When: 2020-08-12

Collection location: Honey Creek State Natural Area, Wisconsin, USA [Click for map]

(coordinates hidden from public) 247m

Who: Angus Mossman (mossman13)

No specimen available

Growing on lower branch of large, dead, open-grown Quercus macrocarpa in wetland. I was calling this P. caseana, but wondering if P. borreri seems to fit better?

Proposed Names

65% (2)
Recognized by sight: Sorediate thallus with pseudocyphellae, black underside, rounded lobes
Used references: iNaturalist, mushroom observer, Brodo key to Lichens of NA

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= Observer’s choice
= Current consensus


Add Comment
I didn’t remember, that’s why I mentioned it
By: Jason Hollinger (jason)
2021-01-01 16:54:54 CST (-0600)

But yes, looking at my own notes, too, it’s all western. As far east as the Black Hills. I thought maybe Andrew had showed me a specimen from WI, but I guess not.

It’s not actually that bad. (So long as jeckeri and caseana stay where they are supposed to!)

pale underside . . . caseana / jcekeri
black below
C- . . . reddenda
C+r . . . borreri

They do all have a different gestalt, as well. Well, again, not caseana and jeckeri. The pruina that is supposed to distinguish them is mighty subtle. But the rest aren’t bad.

Is Jeckeri mostly southwestern?
By: Angus Mossman (mossman13)
2021-01-01 16:45:28 CST (-0600)

I was reading a 2010 paper on the Punctelia situation and was a bit confused about distinguishing jeckeri/reddenda/borreri/caesea. But my understanding was that Jeckeri, reddenda (and borreri hah) didn’t get into WI.

These soralia are more what I expect from P. caseana
By: Jason Hollinger (jason)
2021-01-01 14:09:37 CST (-0600)

(and P. jeckeri is very similar, by the way). But the underside is as black as it gets. Some variation is to be expected in caseana/jeckeri, but it should never get as dark as either this specimen nor the last.