Observation 91209: Catapyrenium boccanum (Servít) Breuss
When: 2012-03-17
Who: zaca
No herbarium specimen

Notes: Growing in a hole of a calcareous rock. It looks like a Psora but with strange squamulas that seem to be crenate and have some tiny dots resembling apothecia but maybe are pycnidia, due to dimensions.

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I agree
By: Jason Hollinger (jason)
2012-04-01 14:45:23 PDT (-0700)

Seems like the safest bet given the information.

Gowing back …
By: zaca
2012-04-01 14:23:26 PDT (-0700)

to the place of this observation I was not able to located again this specimen, so nothing else I can add. In the meanwhile I saw that the portuguese ckeckist mentions three species of Placidium (yet included in Catapyrenium): P. boccanum, P. cinereum, P. squamulosum. Based on the comments by Jason and the description given in the paper I mentioned in my last comment for P. boccanum, I think this is the species of this specimen and I will propose this classification.

[Edited] Index Fungorum takes Catapyrenium boccanum as the current name for Placidium boccanum.

Very well commented!
By: zaca
2012-03-29 16:01:07 PDT (-0700)

In the following paper (that I had access by a pdf available in the internet)

María PRIETO, Gregorio ARAGÓN and Isabel MARTÍNEZ (2010). The genus Catapyrenium s. lat. ( Verrucariaceae) in the Iberian Peninsula and the Balearic Islands. The Lichenologist, 42 , pp 637-684 doi:10.1017/S0024282910000319

there are descriptions of Placidium spp. (among other genera) in the Iberian peninsula. In the one of P. boccanum the differences to P. squamulosum are mentioned.

Note, by the way
By: Jason Hollinger (jason)
2012-03-29 15:29:37 PDT (-0700)

P. squamulosum is on soil, yours is on calcareous rock. That suggests a different species. Maybe P. boccanum?

Sure does
By: Jason Hollinger (jason)
2012-03-29 15:28:16 PDT (-0700)

But there are quite a number that look just like that. At least there are in the desert southwest of North America. There’s a look-alike, for example, that is identical except it has nearly-invisible tufts of delicate hyphae sort of like rhizines underneath. If you wet it down and remove it from the substrate very carefully you can see them. There are quite a few species mentioned in the British Flora differing subtly by color of underside and presence of these lower hyphae and margin color. I don’t feel confident with the group yet without more experience and at least a few confirmed ids to work with.

Jason, please have a look
By: zaca
2012-03-29 14:02:02 PDT (-0700)

at this photo: British lichens. It looks very much the same, doesn’t it?

Might be impossible to say anything without specimen
By: Jason Hollinger (jason)
2012-03-29 13:07:27 PDT (-0700)

I find the squamulose peritheciate lichens to be an extremely difficult group even with a specimen in hand.

Never thought …
By: zaca
2012-03-29 11:28:56 PDT (-0700)

of it as being perithecia, but it is a possibility. I have no material from this observation, but I’ll try to review it. Thanks, Jason.

Looks like perithecia
By: Jason Hollinger (jason)
2012-03-29 11:21:22 PDT (-0700)

Try Peltula, Toninia, Placidium. Will probably need to see spores and spot test.

Created: 2012-03-29 10:18:11 PDT (-0700)
Last modified: 2012-04-01 14:26:45 PDT (-0700)
Viewed: 114 times, last viewed: 2016-12-06 00:06:53 PST (-0800)
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