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Observation 11946: Cladonia hammeri Ahti (Site ID) (Cladonia pulvinella)

When: 2008-10-04

Collection location: La Crescenta, Los Angeles Co., California, USA [Click for map]

Who: Jason Hollinger (jason)

Specimen available

Notes:
This is abundant on sunny exposed mossy banks along trails and roadcuts throughout the foothills around the San Gabriel Valley. I’m fairly confident that it must be Cladonia hammeri, a species newly described in Nash’s Sonoran Flora. The distinguishing characteristics seem to be:

CUPS: broad, on short podetia, completely decorticate, covered with corticate granules and schizidia both on the podetia and inside the cups, esorediate
SQUAMULES: esorediate, pale grayish, strongly curled up in dry weather exposing the pure white cottony undersides

They have a rather whitish, granular overall appearance — much more so than other Cladonia, such as C. pyxidata (at least partly areolate-corticate), C. chlorophaea, C. asahinae (more finely powdery or granular).

According to Ahti and Hammer (who did the treatment for Cladonia in Nash’s flora), this is explicitly common in southern California.

Images

Conspicuously decorticate podetia, seen from side, at 10×.
Granules/schizidia inside cup, seen from above, at 10×.

Proposed Names

92% (2)
Used references: Nash’s Sonoran Flora

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= Observer’s choice
= Current consensus

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