Observation 175155: Pleopsidium flavum (Bellardi) Körber

When: 2014-08-09

Collection location: Castle Mound Pine Forest State Natural Area, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

No specimen available

Proposed Names

61% (2)
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Used references: ID provided by Jim Bennett

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Jim Bennett returned ID P.flavum
By: Andrew Khitsun (Andrew)
2015-05-07 21:45:42 CDT (-0400)

but once again, it’s not this immediate specimen

Okay, maybe it is…
By: Jason Hollinger (jason)
2014-08-24 16:42:46 CDT (-0400)

You’re right, these are pretty ugly specimens. It’s really hard to tell what’s an apothecium and what’s just discoloration due to damage. :(

Looking at a whole bunch of photos of good Pleopsidium (it’s a pretty species!), the thing that looked wrong to me is the lobe shape. Pleopsidium has markedly convex lobes, while the yellow Acarospora often have flat lobes, even with the margins often folded or lifted. That’s what I thought I was seeing here, but on close inspection, it may just be the conditions and damage making it look “wrong”.

I have a specimen taken,
By: Andrew Khitsun (Andrew)
2014-08-24 16:40:18 CDT (-0400)

but not from the crystals but from nearby sandstone wall – those chip of quite easily. But there might be two species coexisting near one another too…

That’s because this is Acarospora, I’ll bet
By: Jason Hollinger (jason)
2014-08-24 16:32:18 CDT (-0400)

I know the key character is supposed to be the radiating lobes at the margin… but my instinct tells me this is the exception. It’ll be hard to prove one way or another from these photos, though. :(

Substrate is the star here.
By: Andrew Khitsun (Andrew)
2014-08-24 16:18:45 CDT (-0400)

The lichen wasn’t doing well here. Maybe the location is not prime? Usually this species thrives on vertical cliffs out in the open, while at this location it was obscured and overshadowed by trees.
But I wanted to highlight the substrate instead: crystals. Whether it’s Citrine or something else – I don’t know. Other lichen species didn’t mind growing on it too.

Created: 2014-08-24 16:09:49 CDT (-0400)
Last modified: 2015-05-07 21:51:37 CDT (-0400)
Viewed: 52 times, last viewed: 2017-06-18 17:57:14 CDT (-0400)
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