When: 2012-02-18

Collection location: Salt Point State Park, Sonoma Co., California, USA [Click for map]

Who: Debbie Viess (amanitarita)

No specimen available

Species Lists


note oddly bisected bacilliform spores.

Proposed Names

45% (2)
Recognized by sight: peridium dark red brown in age, with appressed rhizomorphs; red edge to peridium when halved; gleba dull yellow, darkening.
Based on microscopic features: spores bacilliform, appear bisected under scope, 6.5 × 2.
Based on chemical features: odor pleasant, slightly fruity.
57% (1)
Recognized by sight: bisected-appearing spores not uncommon to see in Rhizopogon sp., according to Tom Bruns. He also didn’t think that this one was R. roseolus. He told me that w/out knowing the host tree, it’s pretty hopeless on microscopy alone…and I didn’t collect it.

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= Observer’s choice
= Current consensus


Add Comment
Need to be more confident, Debbie. I think this is a good fit with R. roseolus.
By: Daniel B. Wheeler (Tuberale)
2012-08-29 04:48:49 CEST (+0200)

According to Smith, Smith & Weber, R. roseolus Corda sensu A.H. Smith is "Fruiting body 1-2 cm. KOH intensifying the rose color; gleba finally olive; spores 6.5-8 × 2.8-3.2 microns; peridium of appressed hyphae 4-10 microns wide, in KOH the entire layer diffused with rose pigment, as revived vinaceous-brown.
“Under lodgepole pine, Idaho, July; also reported from British Columbia and Michigan.”

Fits. The overall rose color is suggestive, as are the spores.

BTW, even A Smith was not always so certain of what he was looking at. He once said “While it is true I probably have the largest collection of Rhizopogons in the world, I’d like to note I also have the largest collection of un-identified Rhizopogons in the world.” What Smith collected in July in Idaho might well be found in coastal California in February.