Observation 47318: Pluteus Fr.

When: 2010-06-22

Collection location: Jamieson Park, Poynette, Wisconsin, USA [Click for map]

Who: Steve Nelsen (sfnelsen)

No specimen available

cap 3 cm, stem 6 cm long, pale gray, striate. Growing near the base of a live pine tree. Spores pink, ‘nuleate’, smooth, broad elliptical, ~7 microns in longest dimension. The stem does not, however, have the yellow-brown stains from the base up that were expected from the description I have.
“nucleate” (not nuleate!), and “chrysophaeus”, not chrysopheus or whatever I said in the notes, which do not come up for editing when I hit “edit”.

[admin – Sat Aug 14 02:01:33 +0000 2010]: Changed location name from ‘Jamieson Park, Poynette, Columbia Co. WI, USA’ to ‘Jamieson Park, Poynette, Wisconsin, USA’


Copyright © 2010 Stephen F. Nelsen
Copyright © 2010 Stephen F. Nelsen

Proposed Names

27% (1)
Used references: Orten, P. D. British Fungus Flora 4. Pluteaceae: Pluteus and Volvariella,
Based on microscopic features: cap cuticle with inflated cells (so is in Sect. Celluoderma). Horned cystidea ~ (~54×18 μ) are present (does chrysophaues have them?)
57% (1)
Recognized by sight

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Add Comment
horned cystidia and a hymeniderm do not go together
By: else
2010-06-23 03:16:11 WIB (+0700)

Pluteus species are divided into two main groups: those with horned, thick-walled pleurocystidia and a cutis-like pileipellis; and those with non-horned, thin-walled or no pleurocystidia and a pileipellis that can be either a cutis, a hymeniderm or with upright inflated cells.

The group of the Celluloderm species do not have horned cystidia and the pileipellis is made up of club shaped to balloon-shaped cells standing side by side forming a nice closed upper surface.

For the species with a celluloderm, there is a nice key for North America available, for free:
Minnis, A. M., and W. J. Sundberg. 2010. Pluteus section Celluloderma in the U.S.A. North American Fungi 5(1): 1-107. at http://pnwfungi.org/articles_volume_5.htm