Observation 64820: Agrocybe putaminum (Maire) Singer
When: 2011-03-25
Herbarium specimen reported

Notes: These were growing on wood chips among hundreds of Stropharia riparias.
The caps were up to 9.2 cm across and basically dry and smooth with some cracking in age. Didn’t get a strong odor but perhaps sl. farinaceous when cut.
Could not get a spore print and in fact the gills seemed to be almost devoid of any significant quantity of spores. What spores I could find seemed to be some shade of brown and I’ve included a photo of a single spore that looked representative. They were ~ 12-15 X 9-10 microns, smooth, with a somewhat small germ pore.
There was some gill cystidia which was not abundant and I think was mostly Cheilocystidia. It had a rather elongated neck which looked like what Largent calls “ventricose-rostrate”. And that is basically led me to narrow the genus choices down to Agrocybe. However, I’m open to any other suggestions.

Images

138779
138780
Lonely spore in KOH @ 1000X
138781
Cheilocystidia in Congo Red @ 1000X
138783
Cheilocystidia in Congo Red @ 1000X
138784
Cheilocystidia in Congo Red @ 1000X

Proposed Names

29% (1)
Eye3
Recognized by sight
61% (2)
Eyes3
Recognized by sight: yellow-brown colors, finely floccose-scurfy stipe and grooves at apex, spores in range, with germ pore

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Thanks Christian, looks good
By: Ron Pastorino (Ronpast)
2011-03-27 11:14:53 PDT (-0700)

for Agrocybe putaminum. The darker cap color threw me off as most references show a more buff color and little in the microscopic details. However, I see in Else Vellinga’s article in Fungi magazine, the spores and cystidia match up well.

Created: 2011-03-27 10:00:26 PDT (-0700)
Last modified: 2011-03-27 20:00:39 PDT (-0700)
Viewed: 70 times, last viewed: 2016-08-08 19:19:08 PDT (-0700)
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