Observation 277146: Pholiota (Fr.) P. Kumm.

When: 2017-05-18

Collection location: Fernbrook, Pennsylvania, USA [Click for map]

Who: Phil Yeager (gunchky)

No specimen available

Caps 3-5 cm wide. Stipes 3-5 cm long x ~7 mm at apex. solid, fibrous, brittle. Flesh thin, white. Spore print brown; spores 5.8-7.2 × 4.6- 5.7 um. KOH on cap turns dark red then black.
Found on what may be Tilia platyphyllos. Last photos show the bark and heart-shaped serrate leaves.


Proposed Names

29% (1)
Used references: Kuo
Based on chemical features: KOH color changes
61% (2)
Recognized by sight: cf. aurivella

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= Observer’s choice
= Current consensus


Add Comment
Thanks Rocky
By: Phil Yeager (gunchky)
2017-05-23 16:26:52 ADT (-0300)

Your opinions and comments are greatly appreciated.

Hi Phil
By: Rocky Houghtby
2017-05-22 22:06:52 ADT (-0300)

Alexander Smith says this about macro chemical reactions in his Pholiota book:
KOH on the fresh basidiocarp usually gave some degree of browning reaction, but more studies are needed here as our data are necessarily incomplete, though the KOH reactions are apt to be at least somewhat similar on both fresh and dried material. KOH often dissolves the yellow to brown pigment to some extent. This is readily observed in the mounting medium.

In my opinion, potassium hydroxide reactions of the suprapellis are not particularly relevant in either Pholiota, or Gymnopilus.

By: Phil Yeager (gunchky)
2017-05-22 21:29:27 ADT (-0300)

Just read Kuo’s description of P. limonella’s similarity to P. aurivella except for spore size. He mentions KOH turns these species caps red to orange, but does not mention red becoming black. Can you elaborate? Thanks.

Thanks Rocky
By: Phil Yeager (gunchky)
2017-05-22 21:01:26 ADT (-0300)

My original assumption was a Pholiota species but when KOH turned the cap color red then black I thought Gymnopus. Can you lead me to some reference that describes color change in Pholiota when chems. are applied? Thanks.

Created: 2017-05-22 19:53:21 ADT (-0300)
Last modified: 2017-05-23 16:26:06 ADT (-0300)
Viewed: 76 times, last viewed: 2018-08-25 23:13:55 ADT (-0300)
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