Observation 68271: Parmelinopsis minarum (Vainio) Elix & Hale
When: 2011-05-21
Who: zaca
No herbarium specimen

Notes: The coralloide isidia is the distinguish feature of this specimen.

Proposed Names

47% (2)
Eye3
Used references: Irish lickens, CNALH
Based on chemical features: See attached photo.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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OK!
By: zaca
2011-05-29 19:05:45 CDT (-0500)

Good exercise with P/C. Thanks, Jason.

I doubt Xanthoparmelia
By: Jason Hollinger (jason)
2011-05-29 18:28:00 CDT (-0500)

I’ve never seen any Xanthoparmelia that “ruffled”. They’re almost always closely attached to the rock, or in some cases (e.g. X. coloradoensis) the interior lobes are much narrower and almost lobulate and overlapping. Also, you should have seen clear KC+ golden spot test.

Back to Parmelinopsis: yours is an ambiguous case in my opinion. It is clearly not ciliate, as you say, but the isidia are dark-tipped. Pros and cons for the two species:

isidia dark-tipped isidia not ciliate isidia thick and stout when young lobe tips rounded on rock
P. minarum bad not bad ~good good good
P. horrescens good not good ~bad ~bad bad

Just thoughts.

I understand your proposal, but …
By: zaca
2011-05-29 17:18:02 CDT (-0500)

… I couldn’t find any trace of cilia in isidia, even at full magnification of the photos.
Could it be Xanthoparmelia conspersa? (Look at this photo on flickr.)

Interesting
By: Jason Hollinger (jason)
2011-05-29 16:49:02 CDT (-0500)

Brodo neglects to mention rock as a possible substrate for P. horrescens in Lichens of North America (but does mention rock for P. minarum).

In my experience (both are common here in the southern Appalachian Mountains), P. minarum is much more common on rock, and indeed farily frequent on bright rock outcrops in deciduous forests. I’ve only seen P. horrescens once on rock, and it was clearly unhappy about growing there.

Neither is on the checklist for Portugal, but that doesn’t necessarily mean anything, just that they’re presumably uncommon. The Sonoran Flora specifically mentions that P. minarum occurs in Europe.

The difference I find most useful (which can be conveniently verified by doing the C test on the medulla) is that the isidia are always at least black-tipped in P. horrescens, and in an extremely well-developed specimen like this, I would expect the isidia to be abundantly ciliate, i.e. with black hairs growing out of the tips.

If we assume it is Parmelinopsis, then I vote for P. minarum.

Thanks, Jason, for the correction. However,
By: zaca
2011-05-29 16:12:23 CDT (-0500)

in Irish lichens the chemistry is:
“Cortex K+ yellow. Medulla K-, C-, KC+ rose-red, P-, UV-”.
Since I didn’t made test to the medulla, I didn´t take medulla reactions into account.
Concerning the habitat, in Irish lichens it is written:
“‘Old forest’ indicator species, found on neutral to acid-barked old trees and rocks in humid, long-established woodlands.”
I couldn’t find either an alternative to the species proposed.

Note mistake in CNALH site
By: Jason Hollinger (jason)
2011-05-29 15:41:40 CDT (-0500)

Parmelinopsis horrescens is C- KC+ rose, P. minarum is C+ pink KC+ rose. This is a remarkably well-developed specimen, but I can’t come up with any alternatives to these two species. Supposedly P. horrescens doesn’t occur on rock, but I’ve seen it there once. Parmotrema is another possibility.

Created: 2011-05-29 14:52:44 CDT (-0500)
Last modified: 2011-05-29 16:49:35 CDT (-0500)
Viewed: 61 times, last viewed: 2016-10-22 22:44:48 CDT (-0500)
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