Observation 105788: Agrocybe dura (Bolton) Singer
When: 2012-08-17
Herbarium specimen reported

Notes: Habitat
Old recreation field, mixed grasses and sedges.

Pileus
2-6cm, sub-hemispheric becoming convex, yellow or white, minutely rugose becoming radially aerolate, appendiculate with partial veil remnants lasting well into maturity.

Lamellae
Adnexed, starting grey becoming tawny and eventually cinnamon brown

Stipe
Longitudinally striate, minutely textured.

Spores
with a suprahilar depression, smooth, germ pore central .5-1 micron, walls .25 micron, tobacco brown in H2O. 11.45 X 6.61.

Basidia
2 and 4 spored, clavate, 30.7 X 10.5

Cheilocystidia
Mostly utriform, some broadly utriform- pyriform. 36.28 X 14.7

Pleurocystidia
Rare, sub-globose. measurement pending

Caulocystidia
Very abundant, versiform, ranging from cylindric capitate to clavate capitate and narrowly utriform. 47.5 X 18.2

Hymenophoral trama
Sub-parrallel, inflated hyaline hyphae

Pilepellis
A trichoderm, some terminal elements seeming differentiated but not so much as to call them cystidia. Hypahe thin, mostly hyaline to light brown in KOH. Pileus trama interwoven.

Taste
Unremarkable

Images

426758
426759
426760
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426762
1000X_H2O
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Cheilo_400X_H2O
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Cheilo_1000X_congo_red
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Cheilo_1000X_H2O
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Pleuro_1000X_KOH
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Caulo_1000X_KOH
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Stiptipellis_1000X_KOH
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Hymenophoral_trama_400X_KOH
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Pileipellis_100X_KOH

Proposed Names

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

Add Comment
A. dura looks pretty good.
By: Byrain
2014-06-15 22:18:32 CDT (-0400)

The cystidia look right compared to their illustrations, the spores fit in size and shape, the macro seems right, it keys easily and the Q in fan6 is “(1.25)1.40–1.85” where 1.25 is the lowest recorded number. I would go ahead and call this A. dura until DNA proves its not.

Mycowalt, fan6 says this:

“In contrast to Singer (in Sydowia 30: 197. [‘1977’] 1978) and in
accordance with Watling (in Br. Fung. Fl. 3: 18. 1982) Agrocybe
molesta and A. dura are here considered synonymous. The correct name
is Agrocybe dura. Bolton’s plate of A. dura seems to represent what is
nowadays in Europe known under that name, though one specimen on
this plate is slightly aberrant.”

I would using suggest A. dura instead of A. molesta.

-
By: Rocky Houghtby
2014-06-15 21:09:09 CDT (-0400)

according to fan6, A. dura has generally thinner cheilocystidia (constricted cylindric), completely different pleurocystidia and thicker elements in the pileipellis. My spore measurements ended up on the bottom extreme for A. dura (with 30 spores measured from a print), with my quotient at 1.75 and in fan6 1.25.

Taste?
By: Byrain
2014-06-15 20:43:13 CDT (-0400)

Spore sizes? What is wrong with A. dura?

Created: 2012-08-17 21:55:36 CDT (-0400)
Last modified: 2014-06-15 23:11:10 CDT (-0400)
Viewed: 89 times, last viewed: 2016-12-11 11:57:48 CST (-0500)
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