When: 2016-05-24

Collection location: Avila Beach, California, USA [Click for map]

35.1816°N 120.7056°W 12m [Click for map]

Who: J-Dar

Specimen available

Notes:
On crumbling Monterey shale bedrock outcrop.

Effigurate, whitish grey, tightly adnate thallus with few black pruinose apothecia. Thallus lobes with thick white pruina. Hymenium hyaline, hypothecium brown. Pycnidia common.

Spores 8/ascus, 1-septate, brown, “ornamented” barely discernable at 1000×.

The smaller round thallus on the left with the black outline (prothallus) may or may not be a younger version of Dimelaena radiata, I couldn’t tell and there were no reproductive structures.

Images

Apothecium section
Note brown hypothecium
Exciple
With a slightly different focal plane than the previous shot, I think this shows the spore ornamentation described for this species. 1000×.

Proposed Names

85% (1)
Based on microscopic features: Hypothecium brown, spores 1-septate, brown, ornamented

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= Observer’s choice
= Current consensus

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