Observation 61109: Scleroderma Pers.

When: 2010-12-20

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

37.91°N 122.7°W [Click for map]

Who: Bob (bobcart)

Specimen available

Found just above ground under a coast live oak and much larger lodge pole pine. Very solid dark and firm meaty inside with wonderful mushroomy aroma. Small white flecks appear to be veins, but not like most of the other truffle images like Tuber californicum. Outside reference

[admin – Tue Feb 08 12:34:56 +0000 2011]: Changed location name from ‘Marin County, California’ to ‘Marin Co., California, USA’


Proposed Names

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Add Comment
Not a Tuber.
By: Daniel B. Wheeler (Tuberale)
2010-12-21 17:59:27 EST (-0500)

Sorry Bob. Unquestionably a Scleroderma, but not an easy one to pin down.

Specimen has a strongly defined columella, which is unusual. Sterile base typical, but usually has more rhizomorphs attached. Scleroderma are typically at least partially epigeous: above ground, vs. hypogeous (below ground) for most non-dug Tubers.

A hard consistency puts it into the general category of S. laeve/cepa group. The well-defined interior columella has me stumped. Would need to see some mycroscopy for a better guess on this. Both oak and pine are often mycorrhizal associates of Sclerodermas.

A word of caution: while some Europeans use Scleroderma as substitutes for truffles, Dr. James Trappe has strongly warned against eating any/all Sclerodermas from the US West coast. At least one has caused the death of a 110-pound pot-bellied pig in Vancouver, WA. As pig and human physiology are quite similar, a human eating a similar amount of Scleroderma might also be expected to have died. Dr. Trappe urges all Sclerodermas to be considered POISONOUS until proven beyond a shadow of a doubt otherwise.