Observation 102511: Trapelia M. Choisy

When: 2012-07-20

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

34.225° -118.1284° 967m

Who: Jason Hollinger (jason)

Specimen available

HABITAT chaparral on west slopes; SUBSTRATE siliceous rock; ASPECT shaded; NOTES whitish crust, thin and continuous inside but with scattered tiny convex areoles near the margin, ~discrete brownish minutely granular soralia, alga chlorococcoid, medulla white, cortex K- C+pink KC+red UV- 350nm, medulla K- C- KC- UV- 350nm.

J. Lendemer’s key suggests Trapelia or perhaps Trapeliopsis bisorediata (this looks too thin, though). Trapelia placodioides has more obvious marginal lobes. Trapelia obtegens? Many of these are not mentioned in the Sonoran Flora.

From a distance this looked just like a thin whitish Lepraria, so I couldn’t say how common it is, as I typically ignore leprose things.


Thallus margin and soralia, at 30x, stacked.

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Created: 2012-07-22 23:43:40 PDT (-0700)
Last modified: 2012-07-22 23:43:45 PDT (-0700)
Viewed: 49 times, last viewed: 2017-06-13 06:53:12 PDT (-0700)
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