When: 2014-08-09

Collection location: Henry Cowell Redwoods State Park, Santa Cruz Co., California, USA [Click for map]

Who: Thomas Laxton (Tao)

No specimen available

This was growing on the bark of a fallen oak branch.


40X magnification.
40X magnification.
40X magnification.
40X magnification.

Proposed Names

18% (2)
Recognized by sight
28% (1)
Recognized by sight
61% (2)
Recognized by sight: These seem to be double rimmed.

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= Observer’s choice
= Current consensus


Add Comment
By: Jason Hollinger (jason)
2014-08-12 12:40:16 PDT (-0700)

Only two species on CA coast with double rim, that’s cool. Usually need chemistry for this genus. O. subpallescens and O. oregonensis. Brodo 1990 describes latter as having “thick, hard, shiny” rims, with algae confined to lateral margins; the former as having “rough, dull” margins with algae continuous below apothecial disk.