Observation 168046: Physconia grisea (Lam.) Poelt
When: 2014-06-21
Collection location: Braga, Portugal [Click for map]
No herbarium specimen

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Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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By: Elsa (pinknailsgirl)
2014-06-22 03:02:21 BST (+0100)

I wetted it and it turned green, and the underside more whitish. British flora says that the pale rizines can become blackish, however they say “densely white-pustulate pruinose over the whole surface” which this isn’t (it’s only on lobe tips). Their photos are completely different from mine, but google images show that P. grisea is similar to these ones. I checked the available Physconia’s photos of the Iberian species and P. grisea is the only similar so must be it.

By other side, Zaca obs., the only one on MO is a bit different.

British Flora confirms
By: Jason Hollinger (jason)
2014-06-22 02:02:39 BST (+0100)

But P. grisea does have simple rhizines, at least. I seem to remember reading a paper about variation in P. grisea on the Iberian Peninsula, but now I can’t find it. I’m wondering if there is a form of P. grisea or a related species which can have dark rhizines, but otherwise looks like P. grisea.

P. grisea doesn’t have black rizines
By: Elsa (pinknailsgirl)
2014-06-22 01:48:30 BST (+0100)

Imshaugia has brownish or darkening rizines, could it be seen as black? Between black and dark brown…

Any way, this is a very common urban lichen on trees here.

Could it be P. grisea then?
By: Jason Hollinger (jason)
2014-06-22 01:44:18 BST (+0100)

Black rhizines rules out Imshaugia, I think. But simple rhizines should rule out Physconia. I don’t know P. grisea, maybe its rhizines aren’t very squarrose? Not sure what else it could be…

The underside of lobes is brownish
By: Elsa (pinknailsgirl)
2014-06-22 01:33:40 BST (+0100)

cream, with short black simple rizines, strongly appressed to the substrate.

This looks pruinose
By: Jason Hollinger (jason)
2014-06-22 00:34:59 BST (+0100)

Did you check the lower surface?

Created: 2014-06-22 00:05:31 BST (+0100)
Last modified: 2014-06-22 03:02:55 BST (+0100)
Viewed: 30 times, last viewed: 2016-10-21 16:10:24 BST (+0100)
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