Observation 102494: Lepraria knudsenii

When: 2012-07-20

Collection location: Millard Canyon, San Gabriel Mountains, Los Angeles Co., California, USA [Click for map]

34.2188° -118.1405° 693m

Who: Jason Hollinger (jason)

Specimen available

HABITAT mixed oak chaparal forest midway up north slope; SUBSTRATE siliceous rock; ASPECT shaded; NOTES greeish, minute granular diffuse but with thin white hypothallus in cross-section, K~y? C-KC-UV-350nm UV+y 375nm P-or very pale yellow (I’m interpreting this as usnic acid plus faint atranorin).

According to the Sonoran Flora’s emended key to Lepraria in vol. III, L. texta is the only species in the area with usnic acid. But in J. Lendemer’s key to North American Lepraria, he describes L. texta as “not distinctly leprose, appearing to be a continuous network of hyphae and algae with delimited margins”. I saw some material that matches this description much better in the Santa Monica Mountains. I’m forced to conclude that this is L. ecorticata.


Soredia, at 30x, stacked.

Proposed Names

58% (1)
Recognized by sight
87% (1)
Eye3 Eyes3
Used references: det. by J. Lendemer

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2012-07-22 23:08:51 PDT (-0700)
Last modified: 2012-08-30 18:56:42 PDT (-0700)
Viewed: 16 times, last viewed: 2017-06-13 06:52:11 PDT (-0700)
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