Observation 65582: Stereum hirsutum (Willd.) Pers.

When: 2011-04-12

Collection location: near trailhead to four-mile trail, Yosemite Valley, Mariposa Co., California, USA [Click for map]

37.7219° 119.7144°

Who: Tom Bruns (pogon)

Specimen available

I picked this up because I thought it was something a little different, and collecting was so poor that the slight differences caught my attention. It was on a piece of black oak wood, and nearly fully resupinate and fairly pale in color. But the microscopic features fit well.

Species Lists


this is the cutis from the part that was not resupinate (200X)
a pseudocystidium in phloxine
pseudocystida in congo red
spores 1000X

Proposed Names

83% (1)
Eye3 Eyes3
Recognized by sight: our most common Stereum on oak
Used references: Chamuris 1988 The non-stitate stereoid fungi in Northeastern United States and adjacent Canada
Based on microscopic features: Pseudocystida of the right size, acute hyphida without (or few) prongs,presence of a cutis,

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2011-04-16 17:05:58 PDT (-0700)
Last modified: 2011-04-16 17:06:11 PDT (-0700)
Viewed: 28 times, last viewed: 2018-06-15 13:58:53 PDT (-0700)
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