Observation 65943: Sidera lenis (P. Karst.) Miettinen

When: 2010-04-19

Collection location: North side of Yosemite Valley west of Yosemite Falls, Yosemite National Park, California, USA [Click for map]

37.7167° 119.7289°

Who: Tom Bruns (pogon)

Specimen available

Found behind the latrine in the parking lot of the picnic area near El Capitan on a well rotted pine log. Strangely, no one else was looking in that direction.

I thought this was a second collection of the Cineromyces lindbladii because of the shallow, soft white tubes and the white rot. But when I looked at the spores I had to change my mind. My photo of these is not very good because they have almost no contrast with the background, but the shape should be visible. The thick-walled hyphae that remain in KOH is additional evidence that this is different from C. lindbladii.

Thanks to Else Vellinga for pointing out the name change to me. Both C. lindbladii and S. lenis used to be in the genus Diplomitoporus, which is where they key in Polypores of North America.

Species Lists



Proposed Names

83% (1)
Eye3 Eyes3
Used references: Polypores of North America (Its Diplomitoporus in that text), name update from recent publication of Miettinen and Larsson
Based on microscopic features: tiny (3.4 X 1.6) “lunate” spores, no cystidia, clamps present but not common, thickwalled hyphae remain in KOH (unlike Cineromyces)

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2011-04-22 19:36:47 CDT (-0400)
Last modified: 2011-04-22 19:36:47 CDT (-0400)
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