Observation 222205: Rhizopogon roseolus (Corda) Th. Fr.
When: 2015-11-08
No herbarium specimen

Proposed Names

56% (1)
Recognized by sight: The tenacious rhizomorphs over the peridium.
Used references: NATS Field Guide To Selected North American Truffles and Truffle-like Fungi.
84% (1)
Eyes3
Used references: NATS Field Guide to Selected North American Truffles and Truffle-like Fungi.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Large Douglas-fir
By: Daniel B. Wheeler (Tuberale)
2015-11-09 11:13:47 PST (-0800)

is probable host. It doesn’t need to be all that close, either. A 150-foot tall Douglas-fir will have this associated to at least 150 feet away from the trunk. A single example exists where a Tuber oregonense (which is species specific to Douglas-fir) was found in a recently plowed field at the bottom of a furrow some 200 feet distant from the ONLY Douglas-fir. The first was about 200-feet tall. Mycorrhizal fungi will fruit considerable distances from their host trees, which is why it is important to note them in your comments.

When you get into larger tree stands of White pine, Whitebark pine, Subalpine fir, Noble fir, Shasta red fir, Douglas-fir, Western hemlock, Sitka spruce, etc. this becomes, ah, involved.

Host tree confusion
By: Earl (EGLunceford)
2015-11-08 19:44:03 PST (-0800)

In your comment you mentioned that roseolus is found with various conifers, but
Whats strange about this find is that it was near River Birch and Rocky Mountain Maple. A large Doug Fir was nearby but I assumed it was too far away to be considered a host tree.

I have read in the Field zguide to North American Truffles by Trappe, Evans, and Trappe that that maple “rarely supports truffle-forming fungi.” So I mostly ruled out the maple as a viable host tree.

Do you think that the Birch could have been the host tree?

NATS Field Guide
By: Daniel B. Wheeler (Tuberale)
2015-11-08 18:46:52 PST (-0800)

states (under Rhizopogon vulgaris) that “Probably the most widely distributed of all Rhizopogon species, occurring around the Northern Hemisphere with diverse conifers; its basal, root-like cluster of rhizomorphs sets it apart from other, similarly colored species, but that cluster commonly breaks off when fruiting bodies are removed from the soil.” Good job keeping them intact, E.G.!

Created: 2015-11-08 18:18:05 PST (-0800)
Last modified: 2015-11-08 18:44:19 PST (-0800)
Viewed: 23 times, last viewed: 2017-02-19 00:23:21 PST (-0800)
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