When: 2009-12-14

Collection location: Canyon, Contra Costa Co., California, USA [Click for map]

Who: BakerSt10

No specimen available

Species Lists


Proposed Names

85% (3)
Recognized by sight: Growing with Knobcone Pine I found these on the surface on the ground after a rain, I had flipped them over and they showed the hairy root structures I had place a quarter near them for size

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= Observer’s choice
= Current consensus


Add Comment
CureCat may be correct.
By: Daniel B. Wheeler (Tuberale)
2009-12-16 18:09:48 AKST (-0900)

R. ochraceorubens is a distinct possibility. But again, with a photo of the gleba (interior) we’re just tossing around possibilities.

Need dried specimen
By: Daniel B. Wheeler (Tuberale)
2009-12-15 12:36:43 AKST (-0900)

for accurate identification. Mail dried material to Dr. Matt Trappe, c/o Forestry Sciences Lab, 3200 Jefferson Way, Corvallis, OR 97330. It is known that Knobcone pine (Pinus attenuata) forms mycorrhiza with Rhizopogon species, but it is not known which species of Rhizopogon do so. Thus a collection from Knobcone pine is important as a voucher collection for the above statement. The specimen shown appears to be similar to R. rubescens, which forms mycorrhizae with other Pinus species. It has distinctive red rhizomorphs (thread- or root-like attachments) on the outside of the sporocarp. Need to also have a close-up photo of a freshly-cut surface of the Rhizopogon and any changes in color to the interior noted on the collection. For example, Rhizopogon rubescens often turns reddish near the edge of the peridium.