When: 2011-08-22

Collection location: Point Beach State Forest, Wisconsin, USA [Click for map]

Who: Andrew Khitsun (Andrew)

Specimen available


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By: Jason Hollinger (jason)
2012-12-17 00:56:13 PST (-0800)

I’ll pay more attention to these “borderline” cases in the future. Will try to get second (third?) opinions from additional experts as well. Seems Bennett either saw no true soredia, or the critical feature is that it has any pyxidata-like corticate granules. I was under the impression, but can’t verify it now naturally, that any true soredia indicated chlorophaea group. But definitely have to keep an open mind!

Either way, I can accept C. pyxidata with a minimal adjustment of my species concepts.

PS. Thomson and many others call fumarprotocetraric acid K-. I personally like to call it K+ brownish, or in cases where the concentration is high, K+ deep red-brown. Brodo called it K+ “dingy” or something, right? It’s a hard one to describe, and it probably depends on the concentration of your reagent, as well. Also note that in cases of really strong fumarprotocetraric, I’ve even seen faint KC+ pink(!), but that may be due to some secondary presence of protocetraric or other related acids. But this is potentially important to note because cryptochlorophaeic and merchlorophaeic acids are KC+ pink (Cladonia cryptochlorophaea and C. merochlorophaea, respectively). Might be possible to accidentally mistake C. chlorophaea ir C. grayi that has really strong fumarprotocetraric with C. cryptochlorophaea or C. merochlorophaea. Phew, that’s a mouthful. :)

Jim Bennett returned C.pyxidata ID
By: Andrew Khitsun (Andrew)
2012-12-16 17:40:57 PST (-0800)

Maybe it’s something in between :-)
Actually, I think both species might be there mixed up. The specimen Jim had didn’t seem to have any soredia (I’m looking at it now).
Also, Thomson shows both species as K- . What a mess.

In my notes…
By: Jason Hollinger (jason)
2012-03-17 20:32:04 PDT (-0700)

I complained about this being unusually coarse with lots of pyxidata-like corticate granules and corticate podetia… but it definitely has some true soredia, as well, so I stand by C. chlorophaea. It was strongly K+ brown.

By: Andrew Khitsun (Andrew)
2012-03-17 19:13:50 PDT (-0700)