Observation 120571: Lagarobasidium Jülich

When: 2012-12-07

Collection location: Bridalveil Falls trailhead vicinity, Yosemite National Park, California, USA [Click for map]

37.72° -119.6508° 3930m

Who: Tom Bruns (pogon)

Specimen available

On wood. The long thin, SV-, cystidia (80 X 8), elipsoid, non amyloid, non-cyanophilous, thickwalled, non-ornamented spores 5.5-6 X 3-4.4, four spored elongate basidia, and the presents of clamps, are the reasons for my tentative ID. The color seems a little wrong as the specimen is cream colored and the description says pale brown. I did not see incrustations on the tip of the cystidia, but apparently that is variable.

Species Lists


spores in cotton blue
another cystidium (cotton blue)
another cystidium (cotton blue)

Proposed Names

-55% (1)
Used references: Corticiaceae sl. Bernicchia and Gorjón
Based on microscopic features: size and shape of cystidia, spores, and basidia. presents of clamps,
55% (1)
Eye3 Eyes3
Based on microscopic features: See Karen K’s comments. spore size, shape, and reaction in cottom blue fit. The lack of clavate cystidia raises doubt for the only species (L. detriticum) that I have a description of

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Karen Nakasone’s email
By: Tom Bruns (pogon)
2013-01-03 14:47:34 PST (-0800)

Karen and I were corresponding over this one and it was her email that lead to my new name proposal. Here is what she said:

“I checked all the Lagarobasidium species in Mycobank, and none come any close to your specimen.
Another possibility is Hyphodontia sensu lato except that the basidiospore walls look a little too thick. All Hyphodontia species should have pinched basidia and hyphae with distinct, slightly thickened walls.
Lagarobasidium still seems like the closest genus and detriticum is the most common species.”

probably not Amphinema species
By: Karen Nakasone (kkn)
2012-12-27 09:33:46 PST (-0800)

Check out Lagarobasidium detriticum or Hypochnicium species. In Lagarobasidium, at least some of the cystidia should be enlarged near the apex. Also, the shape and size of the basidia is important here. In Lagarobasidium, at least some of the basidia should be slightly narrowed or pinched in the middle. In Hypochnicium, the basidia are large and clavate. The basidiospores in the specimen look like they should be cyanophilous. But this reaction can be variable so I wouldn’t be too concerned about it.

Created: 2012-12-20 12:51:17 PST (-0800)
Last modified: 2013-01-03 14:48:07 PST (-0800)
Viewed: 98 times, last viewed: 2018-04-15 22:22:27 PDT (-0700)
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