Observation 50396: Parmotrema A. Massal.

When: 2010-08-10

Collection location: Sintra, Portugal [Click for map]

Who: zaca

No specimen available

Notes: Chemical reactions illustrated in bottom part of the last photo attached – From left to right: C on medulla; C on thallus; K on medulla (upper)/KC on medulla (down); K on thallus (upper)/KC on thallus (down);.


upper part: underside of lobes; bottom part: chemical reactions (see notes).

Proposed Names

19% (2)
Recognized by sight
Based on chemical features: See notes and the last photo attached
28% (1)
Recognized by sight: broad, rounded, flat but loosely-attached lobes; no cilia
Used references: Lichens of North America, Brodo et al. 2001, pg. 480
Based on chemical features: cortex K-, C-, KC-; medulla K-, C-, KC+ red (implies P. robustum group but I’ve changed my mind about randomly guessing an exact species within that group)

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
You are right!
By: zaca
2011-09-16 10:47:14 PDT (-0700)

It seems that my former concept of F. caperata was a bit strange, to be kind.
Concerning this specimen in particular it is now clear to me that it is a Parmotrema and, as you suggested, a member of P. robustum group. Maybe, this is the best classification for it, and this “name” was already created with regard to MO75010.

Just noticed this one again…
By: Jason Hollinger (jason)
2011-09-16 00:15:13 PDT (-0700)

I recommend looking at all the images of Flavoparmelia caperata on MO: this observation looks different than all the rest, at least to me. By itself it’s not obvious, but seeing them all together, I think it really stands out.

I think your comment about ridges in observation 76343 is very appropriate here. Notice how this specimen has no ridges of any sort, but all the rest do. Some more pronounced than others, but all are at least somewhat rugose toward the center.

Also, note the soredia are only on the margin on this specimen; all the rest have soredia in the center of lobes. And note the almost complete lack of rhizines underneath; Flavoparmelia is covered with tiny stubby rhizines all over the underside almost right to the very edge.

I´m quit confident about F. caperata,
By: zaca
2010-08-16 14:32:45 PDT (-0700)

because it matches all the chemical reactions given in the reference (where K +/- dirty yellow is mentioned) and matches with the photographs presented there.

May be Parmotrema
By: Jason Hollinger (jason)
2010-08-16 13:10:11 PDT (-0700)

Doesn’t look like it has usnic acid to me. There are quite a few species of Parmotrema that look just like this, but which differ primarily in chemistry, soralia and lobe width. The only one I have info on which has K- C- KC+ medulla is P. gardneri, but that KC+ should be a week fleeting pink, not the strong red you’re seeing. Still, I’ll bet it’s in that group.

Created: 2010-08-16 05:48:31 PDT (-0700)
Last modified: 2011-09-16 00:19:40 PDT (-0700)
Viewed: 57 times, last viewed: 2016-10-27 02:48:15 PDT (-0700)
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