Observation 67997: Caloplaca Th. Fr.

When: 2011-05-23

Collection location: Old Bridge North of Solano Park Circle, Davis, California, USA [Click for map]

Who: Byrain

No specimen available

Growing on a stone bridge with several other lichen species and moss. A creek regularly visited by waterfowl and other animals runs underneath it.


Proposed Names

28% (1)
Recognized by sight: I am unsure if the white crust is related or not.
56% (1)
Recognized by sight: orange apothecia on rock crust

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= Observer’s choice
= Current consensus


Add Comment
Two species in second photo
By: Jason Hollinger (jason)
2011-05-23 22:35:27 -05 (-0500)

The white crust goes with the orange apothecia in first photo and left side of second photo; the right side of the second photo it looks like another species of Caloplaca this time without any thallus showing above the surface of the rock.

It’s possible you could narrow down the possibilities based on the texture of the crust and rims of the apothecia, but I don’t have time right now to go through the key. It’s a large and difficult genus, typically requiring microscopy to be sure.