Observation 65279: Conocybe siliginea (Fr.) Kuhner

When: 2011-03-06

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

Who: Douglas Smith (douglas)

Specimen available

This is from the obs, of Debbie Klein:


The first micro-shot is of the gill edge at 400x in Meltzer’s. The cheilocystidia are lecythiform, with apr. 5um diameter ends. No pleurocystidia were obs. Also the basidia were 2-spored, and there were no reactions to the reagent.

The second micro-shot is of the cap surface at 400x in Meltzer’s. The surface is hymeniform, no pileocystidia. If you look closely, there is a slight very thin layer of gelatin it seems in the shot.

The third micro-shot is of the stipe apex at 400x in KOH. The caulocystidia are rather random, globose, lageniform and filiform mixtures in clumps. No lecythiform caulocystidia were seen. Also clamp con. were obs, and no caulocystidia were seen at the base.

The forth micro-shot is of spores on the stipe at 1000x in KOH. The spores are tan, ellipsoid, smooth, with a germ pore. The apr. ave. size is 15 × 9.5 um.

Putting this together with the random non-lecythiform caulocystidia, and large spores from 2-spored basidia, you get C. siliginea. How different this is from C. rickenii is hard to say, they are synonyms in Flora Agarcina Neerlandica vol. 6, but they are kept separate in Hausknecht’s monograph. Although they are only separate by very slight differences in size, color and look of the cap surface. He admits that under the microscope there is no difference. Macroscopically, I can’t quite see the difference either, but by his differences, it seem that these are on the side of C. siliginea. And I’ve called things like this in California C. siliginea before, so I’ll keep it there.

Proposed Names

78% (2)
Eye3 Eyes3
Recognized by sight
Used references: Flora Agaracina Neerlandica vol. 6; “A Monograph of the genera Conocybe Pholiotina in Europe”, A. Hausknecht, Fungi Europaei, 2009
Based on microscopic features: As described in the text.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
No one has commented yet.

Created: 2011-04-07 06:16:33 CDT (-0400)
Last modified: 2011-04-09 11:22:42 CDT (-0400)
Viewed: 122 times, last viewed: 2017-10-28 11:15:53 CDT (-0400)
Show Log