Observation 208508: Lichen P. Micheli

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Recognized by sight
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Recognized by sight

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I’ll defer this to Bennett
By: Andrew Khitsun (Andrew)
2015-07-04 05:09:12 CEST (+0200)

I don’t have means to see such small items.

Yes, they really do blend!
By: Jason Hollinger (jason)
2015-07-03 07:32:49 CEST (+0200)

Okay, then how about a Verrucaria?? ;) Perithecia might look red inside if wet and broken open / damaged… (?)

Apothecia looks similar to the linked image,
By: Andrew Khitsun (Andrew)
2015-07-03 07:14:34 CEST (+0200)

but in this case species has a thallus – those grey areoles or whatever you call them that almost blend with rock.

Here’s what I’m calling Polysporina urceolata from Canyonlands, Utah
By: Jason Hollinger (jason)
2015-07-03 04:57:08 CEST (+0200)

observation 208535 — doesn’t that look a lot like yours?

I just took some photos earlier today of a specimen from NV, exactly the same thing. Just sorta tiny black specks on unused rock surface around other species. No way I saw them in the field, but there under the scope, sure enough, there they are.

I would guess that “unpublished” means that Bennett knows or suspects it occurs in WI but there is no official paper or checklist documenting it yet.

Just checked Thomson and the only species there is P.simplex
By: Andrew Khitsun (Andrew)
2015-07-03 04:47:33 CEST (+0200)

But it’s on acidic rocks. Bennett mentions P.urceolata as “unpublished”, whatever that means. And Sarcogyne privigna looks like a giant compared with this species. The former can be seen with a naked eye, while this species is in the realm of Agonimia size-wise.

This one is on dolomite so there is no doubt about calcareous substrate.
By: Andrew Khitsun (Andrew)
2015-07-03 03:53:56 CEST (+0200)

but I can’t even see the shape of apothecia, so I rely on you seeing something familiar.

Bet this is Polysporina
By: Jason Hollinger (jason)
2015-07-03 03:18:44 CEST (+0200)

The tiny scattered apothecia with black “carbonized” cracked rims and red (when wet) disks and endolithic thallus on (calcareous?) sandstone is typical of the small-fruited Polysporina species (and maybe Sarcogyne privigna, too?). I’ve been seeing a bunch like this from limestone in Nevada recently. (Polysporina urceolata I think, but need verification, don’t trust this genus yet!) If you look around a bit under dissecting scope, maybe you’ll find some with lumps of black on top of the disk, too. That will rule out Sarcogyne.

Didn’t realize I had this:
By: Andrew Khitsun (Andrew)
2015-07-03 02:15:34 CEST (+0200)

The bugger is so small, naked eye can’t see there is a lichen there – just dark spot on the surface. I picked up that rock (Niagara Escarpment dolomite) for something else but under microscope realized this lichen is present. I tried to use my extension tubes to get bigger image, but it’s still too small :-((

Created: 2015-07-03 02:06:23 CEST (+0200)
Last modified: 2015-07-03 07:33:00 CEST (+0200)
Viewed: 58 times, last viewed: 2017-02-20 00:40:35 CET (+0100)
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