Observation 75220: Collema F.H. Wigg.

When: 2011-07-09

Collection location: Planalto das Cezaredas, Portugal [Click for map]

Who: zaca

No specimen available


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I see what you mean
By: Jason Hollinger (jason)
2011-09-04 05:06:06 CST (+0800)

But notice the last photo, the one which is dry. Collemas look totally different dry and wet. And also notice the conspicuous blisters in all of the photos, even the wet ones. That is actually the “key” character for the species. There are many species with isidia of various shapes, but only furfuraceum has granular isidia concentrated on the top of these broad blisters. Your specimen completely lacks any blisters, and the isidia are really globular when mature. If you say it’s not fuscovirens, then I trust you, since I don’t know that species nearly so well; but I assure you this is not furfuraceum!

As you know …
By: zaca
2011-09-04 04:40:59 CST (+0800)

I’m just starting with Collema. Maybe you are right, but if you look to the reference I gave you can see some erected lobes in the pictures presented there. Certainly, it is very different of my understanding of C. fuscovirens. For C. undulatum it is very difficult to see good pictures of it. but, I will investigate.
Thanks, Jason, for your comment.

I know very few Collema
By: Jason Hollinger (jason)
2011-09-04 03:14:17 CST (+0800)

…but C. furfuraceum is one. :) This looks more like C. fuscovirens or C. undulatum to me. C. furfuraceum has thinner edges less curled up, and the characteristic bumps should be obvious. See observation 50031, for example.