Observation 110992: Arthonia Ach.
When: 2012-09-22
Who: zaca
No herbarium specimen

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Recognized by sight
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Collect the whole tree — !!!
By: Jason Hollinger (jason)
2012-09-26 16:38:25 COT (-0500)

I like how you think!

Better days will come;
By: zaca
2012-09-26 16:32:39 COT (-0500)

Maybe next time I’ll bring the whole tree home … or even better I’ll send it to a good lab.

I feel your pain!
By: Jason Hollinger (jason)
2012-09-26 16:20:45 COT (-0500)

I get so disgusted with this group of lichens sometimes. Sure looks like you have good material, too bad.

It was even worst,
By: zaca
2012-09-26 16:09:01 COT (-0500)

This time I was not able to observe any lichen structure (algal layer, asci or spores)and I already repeated the experience. I quit …

Ah, if you’re having trouble finding spores…
By: Jason Hollinger (jason)
2012-09-25 19:12:16 COT (-0500)

That’s a big plus in the Arthonia column. :) The Graphidaceae have thicker apothecia; Arthonia has these really thin apothecia. A big, important difference that really helps even in absence of spores, is the asci of Arthonia are big and “balloon-shaped” (and stain in a particular way, I think). I’ve mistaken Arthopyrenia for Arthonia before, for example, but I can’t remember ever mistaking a graphid for an Arthonia.

As for spores, they are notoriously hard to find in Arthonia, and even then, you’ve got to be very careful to only look at ones that have already popped free from asci (and therefore are fully mature). I’ve misidentified countless specimens because of using immature spores still in the asci, or because I’ve crushed the section so much that immature spores are released prematurely from damaged asci.

I agree that this is most probably an Arthonia,
By: zaca
2012-09-25 14:46:36 COT (-0500)

but one cannot exclude the possibility of a Graphidaceae. Till now I was not able to find any spores of it and I’ll try again.

Arthonia maybe?
By: Jason Hollinger (jason)
2012-09-25 02:09:00 COT (-0500)

Created: 2012-09-23 16:08:47 COT (-0500)
Last modified: 2012-09-26 16:11:12 COT (-0500)
Viewed: 54 times, last viewed: 2016-10-22 18:53:30 COT (-0500)
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