Observation 49486: Ochrolechia A. Massal.

When: 2010-08-01

Collection location: Parque de Monsanto, Lisboa, Portugal [Click for map]

Who: zaca

No specimen available

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good point
By: Jason Hollinger (jason)
2010-08-03 12:13:56 NZST (+1200)

The only Pertusaria in the Sonoran Flora with well-formed disk-shaped apothecia on rocks is P. flavicunda, which is “endemic to western North America”. Hmmm. But there aren’t any rock-dwelling Ochrolechia in the same flora without the usual enormous apothecia. Wait, there are two additional brown-spored Pertusaria (sometimes placed in Megalaria apparently) with disk-shaped apothecia on rocks, but I haven’t seen photos of them: P. islandica and P. occidentalis. I agree with you that it doesn’t look like any Lecanora, at least.

Summary: I’m stumped! :)

I have considered some species of …
By: zaca
2010-08-03 10:22:44 NZST (+1200)

Pertusaria and some of Lecanora as well. The first I eliminate because (at least the species I saw) either the margins of discs are more wrinkled or the thallus is more greenish. Similarly, I eliminate Lecanora because either they live on trees or the margins of the discs are more thin.
Do you have any particular species in mind?
(This is a beatiful specimen, indeed!)

Could be Pertusaria, too
By: Jason Hollinger (jason)
2010-08-03 08:47:45 NZST (+1200)

(Gorgeous specimen!)