Observation 132222: Agrocybe rivulosa Nauta
When: 2013-04-21
(35.6695° -84.2371° 259m)

Notes: Found another one of these Bright Yellow Springtime Agrocybes: http://mushroomobserver.org/91346?q=1CXv2

These tend grow singly (not clustered), cap yellow, not areolate.

I suspect this to be the European Agrocybe rivulosa, imported on woodchips,

Found at edge of mulched trail.

Images

323744
323743
323749
323750
324013
Spores 12 × 7 microns, germ pore 1.5-2.0 microns. KOH mount.
324014
Spores 12 × 7 microns, germ pore 1.5-2.0 microns. KOH mount.
324015
Spores 12 × 7 microns, germ pore 1.5-2.0 microns. KOH mount.
324016
Spores 12 × 7 microns, germ pore 1.5-2.0 microns. KOH mount.
324018
Pleurocystidia spheropedunculate and rare.
324019
Pleurocystidia spheropedunculate and rare.
324020
Basida
324021
Basida
324022
Cap cuticle cellular

Proposed Names

28% (1)
Recognized by sight
61% (2)
Eye3 Eyes3
Recognized by sight: Bright Yellow Pileus, rivulose- more evident in this picture: http://mushroomobserver.org/image/show_image/209281?obs=91346&q=1CXv2
Cap viscid when wet, hygrophanous, radially rimose; Large fragile anulus.
Used references: Flora Agaricina Neerlandica – Volume 6
Based on microscopic features: Spores with conspicuous germ pore of 1.0–1.5 μm wide; Spores on average 11.5–12.0
×
7.0–8.0 μm; lamella edge heterogeneous; cheilocystidia only clavate
and globose, pedicellate
globose (speropedunculate).
Based on chemical features: odor and taste farinaceous

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

Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Nice one Christine!
By: Dave W (Dave W)
2013-04-22 17:05:37 PDT (-0700)

I wonder if A. rivulosa has been previously reported from NA?

Created: 2013-04-21 13:18:03 PDT (-0700)
Last modified: 2013-04-23 15:47:48 PDT (-0700)
Viewed: 229 times, last viewed: 2017-01-06 10:04:10 PST (-0800)
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