Observation 18859: Inocybe (Fr.) Fr.

Okay, here’s the macro:

Pileus medium ochre brown at the center with an orangey wash outwards to lighter straw-colored away from the disc, radially fibrous, splitting. Not rivulose, but perhaps could be called rimose.
Lamellae: Dingy medium-light brown.
Stipe: Striate, glabrous except for at highest part of apex and near the very base. Base slightly bulbed, weakly rimmed. Mostly pallid beige to flesh colored, but with some weak pinkish near the base, and two small, distinct rose colored blotches.

Odor: Spermatic


Spores ellipsoid-amygdaliform? citriform? (not sure what these would be judged), thin walls, smooth, minutely roughened. Some with 1 or 2 apparent “depressions”.

L/W avg: 9.4 × 5.3 μm.

Metuloids / Cystidia: Utriform, with smallish crystals, thick-walled. ~ 60 microns long, walls up to 5 microns thick.

Caulocystidia at apex: Utriform, crystals not present (?) or obscure, some clavate-ventricose, with interspersed filiform cystidia. Clamps observed in hyphae of context at stipe apex.

Caulocystidia at base: More similar to lamellar metuloids (odd…) Perhaps with less thickened walls, and with smallish, sometimes erect crystals. Tufted, and with clusters of broadly clavate, inflated cells around the base.

PS: What is the appropriate terminology regarding metuloids / cystidia with crystals?


Copyright © 2009 Christian F. Schwarz
Copyright © 2009 Christian F. Schwarz
Spores, 1000x, KOH.
Copyright © 2009 Christian F. Schwarz
Metuloids from lamellae.
Copyright © 2009 Christian F. Schwarz
Utriform, clavate-ventricose, and filiform caulocystidia at apex of stipe.
Copyright © 2009 Christian F. Schwarz
Metuloids at base of stipe.
Copyright © 2009 Christian F. Schwarz
Metuloids at base of stipe.
Copyright © 2009 Christian F. Schwarz
Clamps in hyphae of stipe context.
Copyright © 2009 Christian F. Schwarz
Metuloids at base of stipe, 1000×.
Copyright © 2009 Christian F. Schwarz

Proposed Names

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Recognized by sight
Based on microscopic features

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Eye3 = Observer’s choice
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Add Comment
thank you for the photo,Christian!
By: Debbie Viess (amanitarita)
2009-02-25 23:18:29 CST (-0500)

BTW, cool spores; it’s amazing that there can be such a dramatic range of spore shapes in the genus Inocybe….your “lemon-shaped” ones vs those nodular ones that I posted recently look like they are from a whole nuther planet! Yet the fruit bodies themselves are quite similar.


By: Debbie Viess (amanitarita)
2009-02-25 19:37:27 CST (-0500)
By: Christian (Christian Schwarz)
2009-02-25 16:40:52 CST (-0500)

This didn’t key out very convincingly in Nishida’s Key to CA Inocybe. Any ideas?

Created: 2009-02-25 16:28:25 CST (-0500)
Last modified: 2009-02-25 16:28:25 CST (-0500)
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