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I only have scraped some thallus and don’t have any rocky substrate in the mix. The other options are possible – this whole thing is way above my pay level.
Definitely sounds like R. grande is out, though. (Shoot, it really looked like it, too!) I wonder if you’re seeing the dark rock come through because the KOH is dissolving the thallus, or if you’re seeing something like fumarprotocetraric acid (not mentioned for any of the species in the Thomson keys at least), or if you’re seeing the bright red of norstictic acid but it’s being confounded by the dark algal layer coming through? Darn, I had such hopes for this one…
Unless colors are bright and flashy. Now that the test spot is dry, it doens’t seem purplish anymore, but probably can be called very dark yellow to brownish.
K leaves permanent darkening on thallus, which looks a bit purplish, but I could be mistaken about that. K- on medula. C-
But the lichen grow towards the bottom of those bluffs, in shady environment.
Created: 2012-10-17 00:05:56 BST (+0100)
Last modified: 2012-10-17 00:08:57 BST (+0100)
Viewed: 37 times, last viewed: 2016-10-22 13:17:45 BST (+0100)