Notes: on Si rock in intermittently inundated small rivulet; with Staurothele fissa
McCune comments “…the distinctive morphology of the North American streamside material suggests that there is justification for continuing to use a name other than C. atroalba for the semi-aquatic species in North America. In contrast C. atroalba typically occurs in dry, exposed habitats”
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at least based on my reading of McCune’s key. Maybe you’re right about it being easy to overlook. But there are plenty of workers who delight in black button crusts; there are far less conspicuous members of that… um… “elite” group of lichens. It’s always possible that you just have a good eye for interesting things, you know… :)
My feeling was that this seems so easy to ignore in the field, as it isn’t colorful, etc. Sort of like Leptogium rivale, which I seem to find in the Cascades mostly when I’m consciously looking for it. Given what you say I should try to confirm the identification of C. diphyodes though.
Only 12 US and Canadian records on CNALH. Kristinsson has reported it a few times for the arctic, Debolt from Glacier N.P., and Weber in the Colorado catalog. Probably a few other sources I haven’t done yet, too, but you get the picture. Compare to C. impolita, for example, hardly a common species and fairly restricted to the southwest, but it is reported from 15 checklists (at least) and 158 records on CNALH.
Thinking this might be relatively common so I’ll be watching for it in similar habitat.
Created: 2012-10-02 19:04:48 BST (+0100)
Last modified: 2012-10-02 19:12:22 BST (+0100)
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