When: 2009-10-25

Collection location: Briones Regional Park, Contra Costa Co., California, USA [Click for map]

Who: Richard Sullivan (enchplant)

No specimen available


[admin – Sat Aug 14 01:58:53 +0000 2010]: Changed location name from ‘Briones Regional Park, Orinda, Contra Costa Co., California, USA’ to ‘Briones Regional Park, Contra Costa Co., California, USA’


Weeping had largely stopped after dry weather. Texture was rubbery.
KOH reaction on right side after 5 mins.
Spores at 1000x average 6 × 2µm

Proposed Names

19% (2)
Recognized by sight: Dripping Polypore
82% (1)
Recognized by sight: There is a common polypore in WV that is known as the cheese polypore It Exudes a watery milky substance from its pore surfaces.
85% (1)
Recognized by sight
Used references: Phillips,

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= Observer’s choice
= Current consensus


Add Comment
Microscopy and texture.
By: Richard Sullivan (enchplant)
2009-10-29 22:21:55 CST (-0500)

Here are some photos of the (surprise) Cylindrical spores. 6 × 2µm. The body was rubbery and the flesh tasted a tiny bit bitter. A drop of KOH gave a very weak pale yellow reaction ( 4th pic, right side).
After several days of dry weather and also it being late in the evening the weeping had largely stopped.

the two mushrooms may both be “soft” in youth…
By: Debbie Viess (amanitarita)
2009-10-27 11:28:11 CST (-0500)

but they have a decidedly different feel to them: the Ischnoderma is thickly gelatinous like a Fistulina and the Tyromyces feels like thick cotton batting.

By: Paul Derbyshire (Twizzler)
2009-10-27 08:30:13 CST (-0500)

doesn’t rule out Ischnoderma.

It wasn’t soft. I don’t think. I ’ll go back later in the week and poke it.
By: Richard Sullivan (enchplant)
2009-10-26 18:01:13 CST (-0500)
was it soft to the touch?
By: Debbie Viess (amanitarita)
2009-10-26 09:26:49 CST (-0500)

then Tyromyces is a possibility.

Only dripping Polypore I know of is Ischnoderma resinosum
By: Daniel B. Wheeler (Tuberale)
2009-10-25 21:21:40 CST (-0500)

And I don’t think this is it: liquid wayyyy to white, not at all the amber-color of I. resinosum. Maybe something new? Try to collect a specimen next time, please.