Observation 65404: Lichen P. Micheli

When: 2009-07-22

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

Who: Andrew Khitsun (Andrew)

No specimen available


Proposed Names

92% (2)
Recognized by sight

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= Observer’s choice
= Current consensus


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Hmm, I see…
By: Jason Hollinger (jason)
2011-04-11 20:42:34 PDT (-0700)

There look to be a few scattered near the right edge of the top picture, too, now that I look at the full-size version. Sure, let’s go with Aspicilia cinerea until someone comes up with a better name! I defy anyone to prove that it isn’t. :)

By: Andrew Khitsun (Andrew)
2011-04-11 20:33:03 PDT (-0700)

I think I found few ripe apothecia. The very bottom picture, just above the line connecting the center of the photo to its right upper corner (you have to magnify the picture to see it).

Bad crust, no treat for you
By: Jason Hollinger (jason)
2011-04-11 19:08:48 PDT (-0700)

Yeah, these are tough. This blobby growth form may well be useful for id, just wish I knew more about it: Why and under which conditions does it occur? Which species and genera do it? It does seem to be common in Aspicilia. But why does it seem to be an either-or decision: either it produces apothecia or it goes all blobby and bumpy? But without being able to put names to them, it’s hard to put observations into their proper context. Sigh. Sort of a chicken or the egg problem.

Bad crust.
By: Andrew Khitsun (Andrew)
2011-04-11 18:53:25 PDT (-0700)

Yeah, I guess it’s tough to identify these crusts without chemical or microscopical analisys. I’ve spent hours too trying to pin them down just visually, to no avail. I’ll post few more of these baddies in the coming days.

That was my first impression, too
By: Jason Hollinger (jason)
2011-04-11 18:34:12 PDT (-0700)

But on closer examination there are virtually no apothecia visible, and I wouldn’t be too sure they don’t belong to another species. (Say, some Lecanora that’s being overgrown by this blobby monstrosity.) I’m just never sure what to do with things like this which are obviously very mature and well-developed, but somehow never got around to producing obvious reproductive structures — either sexual or asexual. I’ve wasted literally hours on specimens just like this. (Can you tell I’m bitter?) Isn’t Aspicilia cinerea K+y or K+y to red? It’d be something, I guess, but hardly definitive. If this were in the southwest, there’d literally be dozens of look-alike species. Yet another reason you should be thankful you don’t live in Los Angeles!

Aspicilia cinerea?
By: Andrew Khitsun (Andrew)
2011-04-11 18:14:53 PDT (-0700)

It appears to be somewhat similar to my other observation (#65376) of Aspicilia cinerea – the ones where it looks bumpy, almost like a wart lichen, and almost without prominent apothecia (the tiny ones could be seen embedded into areoles (or warts?). Since you identified the other one as A.cinerea, I understand that it develops these warts as it gets older (or maybe under certain conditions?)

No clue!
By: Jason Hollinger (jason)
2011-04-11 18:09:37 PDT (-0700)

A more undistinguished grubby crust would be hard to imagine. And to think, this is probably a spectactular specimen of whatever this is. It’s the sort of thing that gives lichenology a bad name! :) (We should clearly comment on it repeatedly just to force Noah to look at it every time he visits the site!)

Created: 2011-04-11 17:51:30 PDT (-0700)
Last modified: 2013-11-25 05:11:50 PST (-0800)
Viewed: 247 times, last viewed: 2019-08-28 19:52:44 PDT (-0700)
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