Observation 91629: Physcia tribacioides Nyl.

When: 2012-03-31

Collection location: Marteleira, Lourinhã, Portugal [Click for map]

Who: zaca

No specimen available

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Recognized by sight
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So, probably is a Physcia.
By: zaca
2012-04-03 17:25:40 CDT (-0400)
Some species of Physcia form colonies
By: Jason Hollinger (jason)
2012-04-03 16:48:21 CDT (-0400)

I can’t think of any Heterodermia that do that, at least not off the top of my head. But, yes, in short, I think it’s entirely plausible that a Physcia would “go crazy” and colonize an entire trunk with a single confluent mass of indistinguishable thalli. There’s no question that you have found a number of truly spectacular localities in Portugal. Your Collema specimens are so far beyond anything I’ve ever seen, for example. At this point, I’d be willing to believe anything!

I’m based on my short experience.
By: zaca
2012-04-03 16:30:04 CDT (-0400)

Loosely attached Physcia I’ve not found so far. But there is yet another question. How big can the thallus of a Phycia be? I’m asking because the tree that had that specimens on it it is all covered with a continuous(?) thallus of that species.

Interesting comment
By: Jason Hollinger (jason)
2012-04-03 16:09:03 CDT (-0400)

Is it so rare in your experience to find loosely-attached Physcia? (I’m wondering what that says about the habitat for lichens in Portugal!) There are a number of species that can easily be removed from the substrate in North America. I would’ve said the photo of the underside was perfectly in keeping with material I’ve seen.

I had that thought …
By: zaca
2012-04-03 15:18:27 CDT (-0400)

when I looked to the photos (the invasor or invaded Parmotrema and the overall looking of Physcia. But, it will be impossible in a Physcia to raise the thallus to see the underside like I did (the photo is bad, but it doesn’t seems the underside of a Physcia). That’s why I looked to other option.

Oh! I see what’s going on
By: Jason Hollinger (jason)
2012-04-03 15:02:11 CDT (-0400)

There are two species here. Note that the majority of this observation has soft, pruinose, dull lobe tips which are completely pale gray. The broader lobes with the black cilia (bottom of second photo) are shinier, not pruinose, and have distinct black margin. I think the latter is a fragment of Parmotrema, maybe being overgrown by the other.

I would guess the other (main) thallus belongs to Physcia, not _Heterodermia, just based on the overall shape and look. The cortex Heterodermia is made of narrow parallel hyphae, giving it a “flowing” appearance. Physcia has a more “cellular” cortex which just looks sort of dull and uniform. I’m thinking maybe P. tribacioides? I still don’t have a feel for all your exotic Physcia yet, despite all your excellent observations!

Created: 2012-04-03 14:21:36 CDT (-0400)
Last modified: 2012-04-03 20:05:27 CDT (-0400)
Viewed: 66 times, last viewed: 2017-06-12 21:40:17 CDT (-0400)
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