Observation 209539: Caloplaca pyracea (Ach.) Th. Fr.


Copyright © 2015 Jason Hollinger (jason)
Copyright © 2015 Jason Hollinger (jason)

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Recognized by sight
84% (1)
Recognized by sight: see comment

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Added two close-up photos
By: Jason Hollinger (jason)
2016-01-13 12:44:04 WIB (+0700)
Caloplaca pyracea is a recent development
By: Jason Hollinger (jason)
2016-01-13 12:15:36 WIB (+0700)

Sorta. Up until several years ago it was called C. holocarpa all over. That Arup 2009 paper finally helped clarify all the various things being lumped ignominiously into C. holocarpa. Pretty much, everything on trees, especially aspens, birches, etc., became C. pyracea. Stuff with thinner thallus and smaller apothecia on granites and other siliceous rocks stayed C. holocarpa.

In CNALH, it’ all over the place in Wisconsin.
By: Andrew Khitsun (Andrew)
2016-01-13 12:08:23 WIB (+0700)

I wonder, how come it’s not in Thomson or Bennett?

(all of your photos are of C. pyracea)
By: Jason Hollinger (jason)
2016-01-13 04:46:11 WIB (+0700)
Mostly C. pyracea
By: Jason Hollinger (jason)
2016-01-13 04:45:19 WIB (+0700)

Andrew, see my lengthy comment in the notes I took while examining your specimens. (Should be done shortly.) The summary is:

C. flavorubescens has a yellow thallus. At least large regions should be distinctly tinted yellow and K+v even if just weak and slow. (See paper about Scandanavian C. holocarpa group by Arup 2009.) Your material is all exclusively gray and all K-.

One piece was C. cerina: margin entirely gray. The rest comes out as C. pyracea, despite some variation in the outer thalline margin. But all has a well-developed orange inner (proper) margin, and that’s key.

Microscopy: spores 8 per ascus, 10-14(15)x4.5-7.5(15)µm, septum (3)4-5(6)µm; hymenium clear, ~50-80µm; hypothecium usually somewhat inspersed, ~50-80µm; parathecium very well-developed, of dense, fine, intricate but predominantly radiating hyphae; cortex indistinct, ~20-25µm, often with varying amounts of orange granules (K+r) at upper edge of thalline margin; apothecia to over 1mm wide.

(The piece of C. cerina differed in: spore septum was larger, 5-6 µm; parathecium was very thin, to only ~15µm at top; cortex was very distinct, up to ~50µm, never with any orange granules.)

Photos coming later.

I can’t say whether it’s Caloplaca flavorubescens or something else,
By: Andrew Khitsun (Andrew)
2015-07-12 06:21:18 WIB (+0700)

my only other observation tentatively marked as C.flavorubescens is observation 116447. This one looks different, but very similar to zaca’s. The species seems rare here.

Created: 2015-07-11 11:41:48 WIB (+0700)
Last modified: 2016-01-13 12:43:40 WIB (+0700)
Viewed: 62 times, last viewed: 2018-03-07 18:00:14 WIB (+0700)
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