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Hard to beat having a specimen in hand under a scope. The smooth texture over the bumpy sandstone would probably be perfectly obvious up close. But we do the best we can with photos!
Here is another one to add to your collection (from Lichens of WI by Thomson):
“Thallus crustose, chinky areolate to coarsely granular papillate, sometimes showing whitish or dark prothallus…”
I don’t know if we’re talking about the same thing, but I think those lumps just follow the surface of the sandstone: check around the lichen too – it looks pretty bumpy to me.
On the other hand, I just don’t know too many species, and default to the familiar ones.
But see how this set has a “lumpy” thallus. I don’t know if that is significant. I’m used to it being smooth. C. flavovirescens is described variously as:
Sonoran Flora (Wetmore): “areolate, margin abrupt at edge, black prothallus; surface yellowish orange to greenish yellow, smooth”
Lichens of N. Amer. (Brodo): "cracked-areolate to minutely warty, sulphur yellow
Bruce Ryan’s keys: “greenish yellow to whitish yellow, hypothallus gray to black, thallus rimose-areolate, often as large conspicuous single patches”
Ozarks flora (Harris): “thallus pale yellow to grayish or brownish yellow, thin, continuous to rimose”
(Hmmm, Harris has a great Caloplaca key, we should try applying it to some of your more problematic specimens.)
Created: 2012-02-09 14:01:05 AEST (+1000)
Last modified: 2012-02-09 17:39:29 AEST (+1000)
Viewed: 31 times, last viewed: 2016-10-24 03:36:41 AEST (+1000)