Observation 160584: Strobilurus albipilatus (Peck) V.L. Wells & Kempton

When: 2011-11-15

Collection location: Bolinas Ridge, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

Growing on ground/humus in mixed woods of Redwood, tanoak and others.
Caps up to 2.3 cm across and stipes up to 5.8 cm long.
Spore print white and not amyloid.
Spores ~ 3.5-4.0 X 2.0-2.2 microns and smooth and somewhat tear-shaped.
Revisited this one but still not able to pin down, although it appears to be some sort of Gymnopus.

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Add Comment
pileus coloration and spore size…
By: Richard Kneal (bloodworm)
2014-03-03 18:59:14 CST (-0600)

does not fit Strobilurus albipilatus…
accroding to:

also, the gills are described as “cream-colored.”

no Doug Fir in that mixed forest?
By: Debbie Viess (amanitarita)
2014-03-03 12:41:07 CST (-0600)

no doug fir cones, no trullisatus.

yes, the cap is unusually white for albipilatus, ironic name notwithstanding. these specimens are well along in their development, though. If they were young and white, i might agree with you, Noah.

If they were truly growing on the ground, they are not trullisatus.

I do think that they are Strobiluris. Really, no specimen?

You could check the tops of the abundant cystidia for resinous masses…rarely present on albipilatus pleurocystidia.

By: Richard Kneal (bloodworm)
2014-03-03 12:17:36 CST (-0600)

check the pileipellis for broom cells…
the color of the stipe means nothing.

I am sold on this being a
By: Noah Siegel (Noah)
2014-03-03 11:54:29 CST (-0600)

Strobilurus, but not completely on S. albipilatus. It rarely is truly white; it starts off gray to gray brown and fades in age. And having seen a lot of it, I have never seen it this white.

I would lean towards Strobilurus trullisatus on these.

sometimes it is white on top…
By: Debbie Viess (amanitarita)
2014-03-03 10:46:11 CST (-0600)

see my Yosemite collections here on MO. This sp. is also common in the swampy area at Chapman Creek Campground at Yuba Pass in the Sierra. It is a ground dwelling Strobiluris.

Of course, you COULD have one of the cryptic Strobiluris species here. We certainly do not have all of our mushrooms species documented, eh?

OK Noah & CS,
By: Ron Pastorino (Ronpast)
2014-03-03 10:06:56 CST (-0600)

you’ve made a good case for Strobiluris and S. albipilatus would make sense even though Mykoweb and others say that contrary to it’s name, that species doesn’t have a pure white cap (Peck must have thought so?).

By: Noah Siegel (Noah)
2014-03-03 08:35:51 CST (-0600)

The smooth cap, the stipe that yellows from the base up, the white mycelium at the base and small spores all match.

As CS said, S. albipilatus rarely grows on cones, while others can grow on buried cone scales; which are easily overlooked.

Not all Strobilurus
By: Christian (Christian Schwarz)
2014-03-03 00:54:50 CST (-0600)

are on cones. S. albipilatus (which this sort of resembles) is one example.

While not out of the realm of possibilities,
By: Ron Pastorino (Ronpast)
2014-03-02 16:12:04 CST (-0600)

These seemed a little large for Strobilurus.
They weren’t growing on any cones so I wonder how one(Noah) arrived at that conclusion?

spore shape…
By: Richard Kneal (bloodworm)
2014-03-02 13:15:56 CST (-0600)

looks pretty close to me…

If I discount my approximations of
By: Ron Pastorino (Ronpast)
2014-03-02 13:01:09 CST (-0600)

my spore measurements, Marasmius wynnei does fit pretty well.
As the micro photo shows, I wasn’t able to get a good sharp read on the spores.
However, they do have the right shape. Not much of a record for this species on the west coast.

Marasmius wynnei…
By: Richard Kneal (bloodworm)
2014-03-02 12:08:29 CST (-0600)


Created: 2014-03-02 12:02:28 CST (-0600)
Last modified: 2014-03-03 12:21:22 CST (-0600)
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