When: 2009-11-17

Collection location: Annadel State Park, Sonoma Co., Santa Rosa, California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

These were growing on an old log and the caps were about 2.9cm across. The stems were relatively long,~8.0cm X .50cm, and light yellow, although the photo doesn’t quite bring that out. The stem was also fragile, hollow and split easily.
The spores were pink and averaged about 9.3 X 5.4 microns.
The relatively large spores and long stipe rules out Pluteus romellii. Couldn’t find a reasonable alternative.


Proposed Names

-17% (6)
Recognized by sight
31% (4)
Recognized by sight: Can’t suggest a species, though
57% (1)
Used references: Mykoweb

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= Observer’s choice
= Current consensus


Add Comment
I think I agree with Arora
By: Irene Andersson (irenea)
2009-11-21 21:56:45 CET (+0100)

that this form with a yellowish stem might be a separate species.
B. aleuriatus, in my books, is supposed to have a greyish lilac cap and a white or slightly greyish stem, and being smaller but microscopically identical with reticulatus. The shape of these spores do not fit perfectly with it – but I don’t know where to start looking among the 100 described species of Bolbitius..

The evidence does speak for Bolbitius, Irene
By: Ron Pastorino (Ronpast)
2009-11-21 17:21:42 CET (+0100)

and the spore print was not heavy so shades of red are open to variations in interpretation. Another fact in your favor is that Arora in Mushrooms Demystified says that there is a form of Bolbitius aleuriatus in our area that has a yellow stalk and that it may be a distinct species.

By: Irene Andersson (irenea)
2009-11-21 10:05:51 CET (+0100)

Bolbitius spores have a germ pore, Pluteus spores don’t.
A viscid cap, hollow and pruinose stem, also speaks for Bolbitius.

The difference in spore colour between them isn’t that big (reddish brown or pinkish brown), and the impression of a spore print depends a lot on how thick and dense it gets.

Can’t get rusty-brown spores
By: Ron Pastorino (Ronpast)
2009-11-21 05:02:03 CET (+0100)

out of my spore print even though everything else does kind of work for Bolbitius aleuriatus. The spore print is definitely pinkish. I used Melzers to take the spore photo so that may have led to the impression they were rusty brown.

Reminds of earlier obses
By: Irene Andersson (irenea)
2009-11-20 21:50:17 CET (+0100)

named aleuriatus. I don’t know if that’s the right name for them.

By: Johannes Harnisch (Johann Harnisch)
2009-11-20 21:26:40 CET (+0100)

spores look brown so do the gills also…it was growing in moss or wood?