When: 2017-08-17

Collection location: Monterey Co., California, USA [Click for map]

35.861°N 120.3267°W 462m [Click for map]

Who: J-Dar

Specimen available

On crumbling shale bedrock outcropping in a semi-arid grassland environment, along an ephemeral drainage. Full sun southwestern exposure.

Thallus yellow-brown, shiny, consisting of scattered or clumped areoles with 1 to many apothecia each. Algal layer in thallus is distinctly interrupted by hyphal bundles. Areoles are convex, becoming squamulose, with fissures and pits. Apothecia are sunken in areoles, with reddish coloration on rims, disks are dark red-brown, roughened. Hymenium hyaline, hypothecium dingy, epihymenium brown. Spot tests are negative. However, a little K left on the slide from a previous specimen review resulted in yellow pigments diffusing into the surrounding water. C test was definitely negative, but the resulting KC was reddish from the contaminated slide.

Spores many per ascus, simple, hyaline, ellipsoid. 4-5 × 1.5-2.0µm.


Crappy cell phone pic
Interrupted algal layer in thallus, 100x in C
Detail of hyphal bundle break in algal layer, 400x in C
KC result on thallus section

Proposed Names

57% (1)
Based on microscopic features: Interrupted algal layer
Based on chemical features: C- thallus and medulla

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= Observer’s choice
= Current consensus


Add Comment
Possibly younger material of same taxon as Observation 260107
By: J-Dar
2017-09-05 12:04:57 CDT (-0400)

The linked observation may just be old well-developed thallii that had become very squamulose and imbricate, compared to this younger material that is just barely squamulose.