Observation 77851: Lecanora Ach.

When: 2011-10-02

Collection location: Davis, California, USA [Click for map]

Who: Byrain

Specimen available

On an unidentified hardwood tree.


Proposed Names

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Recognized by sight

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Add Comment
Microscopy required
By: Jason Hollinger (jason)
2011-10-03 12:32:50 CDT (-0400)

Looks like L. hybocarpa or related species. To verify: do a thin section of the apothecia, expect large blocky angular clear crystals scattered in the rims, also expect brown granules filling the upper surface of the disk, and these brown granules should dissolve in KOH. Beyond that, need spore size and thickness of the cortex on the side and bottom of the rims (the clear layer between the algae and the edge) – this will help distinguish the closely related species like L. pulicaris, L. circumborealis, etc. Furthermore, the thallus and apothecia of all of these should be K+y.