Observation 51784: Lactarius alpinus var. mitis Hesler & A.H. Sm.

When: 2010-08-28

Collection location: Tuolumne Meadows, Yosemite National Park, Tuolumne Co., California, USA [Click for map]

37.872202°N 119.383013°W

Who: Peter G Werner (pgwerner)

Specimen available

Part of the Yosemite Fungal Survey. Collection # YNP2030.

On streambank of Budd Creek, in moss. Elevation 8585 ft.

Species Lists


Proposed Names

55% (1)
Recognized by sight: Sight ID’d by Debbie Viess
Based on microscopic features: Amyloid, reticulate, russuloid spores.

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
I got microscopy
By: Peter G Werner (pgwerner)
2010-09-03 03:54:38 -05 (-0500)

Yep, amyloid, reticulate spores – I’ll take Russulaceae for $100. Lactarius alpinus sounds like a good preliminary ID, at least until I get a chance to key it a bit deeper.

got microscopy?
By: Debbie Viess (amanitarita)
2010-09-02 09:31:21 -05 (-0500)

my vote is still on Lactarius alpinus, which didn’t look a bit like a Lactarius (nor did it bleed latex) to my eye at first, either…very waxy feel to the cap.

To my eye
By: Daniel B. Wheeler (Tuberale)
2010-09-01 02:54:25 -05 (-0500)

looks like Lactarius. But I see no obvious latex. Of course, not all Lactarius produce much latex, either. If the specimen had a more appressed cap, might be something in the related Arcangeliella. But the gills look too well-spaced to be that genus, and not at all convoluted. Sporocarp probably also too large to be Arcangeliella.

Might try smelling the dried material, though. Sometimes there are distinctive odors of dried material not present in fresh picked.

By: Douglas Smith (douglas)
2010-09-01 02:11:33 -05 (-0500)

If Peter has the dried stuff, the Lactarius spores are pretty easy to tell from Clitocybe spores, and should only take 5 mins or so under the scope. So, he should be posting the answer here later today? (With photos of the spores?)

I’d be surprised…
By: Christian (Christian Schwarz)
2010-08-31 12:09:16 -05 (-0500)

Debbie, I also see a Lactarius. Sometimes the frb texture can be a bit misleading – I’ve had a firm Clitocybe stipe snap pretty cleanly, and often fragile Russula stipes break raggedly… not very helpful when you are trying to explain the difference while leading a mushroom walk.

Not russuloid
By: Peter G Werner (pgwerner)
2010-08-31 11:11:50 -05 (-0500)

Its definitely not Lactarius or Russula. The texture of the sporocarp is agaricoid rather than russuloid.

I’ll scope it and see what I can come up with.

scope it Peter.
By: Debbie Viess (amanitarita)
2010-08-31 10:53:19 -05 (-0500)

it reminds me of that curious mountain Lactarius, L. alpinus, also found in moss. link to my collection here: http://mushroomobserver.org/image/show_image/101849?obs=51723&q=1ZOV

if so, the spores are amyloid and reticulate.

Created: 2010-08-31 03:07:38 -05 (-0500)
Last modified: 2011-04-01 18:25:36 -05 (-0500)
Viewed: 143 times, last viewed: 2019-02-05 12:32:44 -05 (-0500)
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