Observation 122751: Tomentellopsis

When: 2013-01-07

Collection location: UC Berkeley, Berkeley, California, USA [Click for map]

Who: Tom Bruns (pogon)

No specimen available

Nhu Nguyen collected this with Else Vellinga near the UC football stadium under coastal live oak. and Pinus muricata.

I’m tentatively calling this Lindtneria because of the cyanophilus globs in the basidia. I looked at Tomentellopsis briefly, but the spore ornamentation is too subtle and the presence of cystidia (assuming they really are cystidia) is not consistent. The lack of clamps seems to eliminate Trechispora. if I interpret the cystidia as cystidioles then there is president in Lindtneria and it keys to L. hydnoidea, but the spores are too small for that species 4-5 X 3-4 versus 7.5-9.5 X 7-9. The cyanophilus inclusions in the basidia are supposed to be the primarily, defining feature of Lindtneria, and this are weird enough that I’m leaning toward that genus, but if that is correct, its not a species that is in the European key.

Species Lists


Cystidioles – two in image
basidium in meltzers
basidium in cotton blue
basidium & spores in cotton blue
basidium in cotton blue

Proposed Names

28% (1)
Used references: Worked through the Keys in Corticiaceae s.l Fungi Europaei to several dead ends
Based on microscopic features: Spores minutely spiny, hyaline, non-amyloid or dextrinoid. 4-5 X 3-4; Basidia clavate 20 X 6.5 and with Cyanophilus globs; cystidia narrowing to tip, thin-walled, non-incrusted, SV-, 40 X 2 (at tip), no clamps, but some odd bumps that are not associated with septa.
57% (1)
Used references: Dr. Karen Nakasone

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
probably a Tomentellopsis species
By: Karen Nakasone (kkn)
2013-04-08 16:35:42 CDT (-0500)

This is a puzzle. The consistency of the specimen is more like that of Tomentellopsis rather than Lindtneria. Its basidia resemble that of Tomentellopsis pulchella (Mycotaxon 107:57. 2009) although the ornamentation on the spores is quite understated compared to other Tomentellopsis species. Tomentellopsis pulchella and T. pusilla have smallish basidiospores, 4.5-5.5 um and 4.6-5.5 um, respectively.
The shape and size of the basidia and basidiospores preclude genera such as Trechispora, Hypochnicium, Botryohypochnus, Gloeocystidiellum s.l.
Tomentellopsis seems like the best generic placement.

Created: 2013-01-13 15:01:38 CST (-0600)
Last modified: 2017-03-02 15:42:23 CST (-0600)
Viewed: 75 times, last viewed: 2017-11-01 12:38:59 CDT (-0500)
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