Notes: On sandstone bedrock along a seasonal stream in an arid grassland setting.
Tiny dark brown umbilicate lichen with marginal soralia. Apothecia not seen. Pycnidia not seen. Squamules <1 mm, diffuse green-algal layer above medulla. Underside of squamule dark but slightly lighter than upper cortex color, rhizines absent, central umbilicus present.
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Might be worth trying just as an exercise. Likewise try to pay attention even to trebouxia when you happen to see it under the scope. It’s harder to distinguish these genera than it should be. Might as well start building good mental images of what the common ones look like!
About the cyanobacteria color not showing much blue. I haven’t actually looked at a lichen with cyanobacteria (well, other than this one apparently…)
Peltula should have cyanobacteria not green algae. I think you might be right about the id, though. I think it only proves how subtly difficult it can be to distinguish cyanobacteria from green algae. (Forget looking for anything bluish, most commonly it looks “forest green” or “olive green” to me. Green algae should be a brighter “grass green” by contrast.)
Created: 2015-10-31 04:30:51 CET (+0100)
Last modified: 2016-10-11 04:33:59 CEST (+0200)
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