Observation 78256: Catathelasma imperiale (Fr.) Singer
When: 2011-10-07
Herbarium specimen reported

Notes: Originally identified as Catathelasma imperiale (Fr.) Singer, based on the presence of a double ring and the size of basidia (40-70 µm long)
Clamps present; cheilocystidia (“hyphal ends”) also present

Proposed Names

86% (1)
Eye3 Eyes3
Recognized by sight: Presence of double ring
Based on microscopic features: 6 measured basidia 40-50 µm long and another 5 basidia 50-70 µm long
Based on chemical features: Farinose smell
4% (3)
Recognized by sight: Gray cap and ashy gray colors on stem.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
Catathelasma macrosporum?
By: Oluna & Adolf Ceska (aceska@telus.net)
2011-10-11 22:23:37 BST (+0100)

According to Singer, R. in Sydowia 31(1978) p. 193-194, Catathelasma macrosporum is similar to C. ventricosum, but has “broader” spores (the size ranges given are not too convincing, though). The same article cites this species as “C. macrosporum (Peck) Singer” and I suspect that both C. ventricosum and C. macrosporum were originally described by Peck, and the combinations were made by Singer at the same time. I do not have the access to the original journals where these two species (or their name combinations) were published and I don’t have time to trace them out. Singer in Sydowia mentioned Picea engelmanii as the habitat for C. macrosporum, and this may indicate that it occurs in higher elevations.

By the way, Singer in Sydowia gives an identification key to all known to him Catathelasma species. That key, however, is not too good.

Hutchinson, L.J. in Mycologia 84(3): 472-475 gives a map of the distribution of Catathelasma imperiale in North America and its dots on the West Coast indicate that it is not so rare here. Unfortunately, he did not give a similar map for C. ventricosum.

Adolf

But what about the smell..?
By: Irene Andersson (irenea)
2011-10-09 08:01:25 BST (+0100)

Has anyone seen a detailed description of Catathelasma macrosporus?

I am colorblind
By: Oluna & Adolf Ceska (aceska@telus.net)
2011-10-09 07:46:05 BST (+0100)

I am colorblind and I have to use some other morphological characters than the color of the sporocarp. See the note below. Have a look at our observation of entirely white Pluteus pouzarianus:
http://mushroomobserver.org/68217?q=7pJ1
I am sorry, with my genetic defect I even cannot see the pink gills that that mushroom has.
Adolf

OK
By: Irene Andersson (irenea)
2011-10-08 11:52:43 BST (+0100)

I see now that it’s not ventricosum, probably closer to imperiale..

Created: 2011-10-08 08:03:58 BST (+0100)
Last modified: 2012-02-06 08:39:43 GMT (+0000)
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