When: 2018-02-28

Collection location: Los Osos, California, USA [Click for map]

35.3188°N 120.8526°W 3m [Click for map]

Who: J-Dar

Specimen available
Collection number: Jason Dart 947

On bark in the coastal zone, on the back edge of Morro Bay. Extreme maritime influence.

Thallus a whitish crust almost completely covered in yellow to green soredia, C+R, KC+R, K-. Trentopohlioid agae. Apothecia uncommon, immersed to sessile, thick raised margin with algae, disk and margin with white C- pruina. In section the apothecia shows a dark carbonaceous hypothecium and exciple, a short hymenium, and dark epihymenium. The hypothecium is K+green.

Spores are narrowly ellipsoid, hyaline and few and far between. I couldn’t tell details but they appeared multi-septate.


Habitat at back edge of Morro Bay

Proposed Names

57% (1)
Based on microscopic features: Trentopohlioid algae
Based on chemical features: C+R

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= Observer’s choice
= Current consensus


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