Observation 100879: Elaphomyces granulatus Fr.
When: 2012-07-16
Collection location: Maine, USA [Click for map]
No herbarium specimen

Proposed Names

3% (2)
Recognized by sight
78% (2)
Eye3 Eyes3
Used references: Arora, Mushrooms Demystified, p. 865. Without embedded spores in the outer shell (peridium), although spores collected during slicing do appear on the lower peridium, IMO those were transported there during slicing. True E. muricatus has spores embedded in the peridium all around the gleba. Another feature of E. granulatus are the prominent warts on the outer peridium, which often take a hand lens to see. However, as E. muricatus also has those, it is not a definitive marker by itself.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Soil poor
By: Erlon (Herbert Baker)
2014-05-05 19:32:40 PDT (-0700)

Yes, the soil was very rocky and sandy.

Still trying to understand marbled.
By: Daniel B. Wheeler (Tuberale)
2012-07-18 11:10:03 PDT (-0700)

I know Arora used that term in Mushrooms Demystified. And it does make a good simile, kind of like fat-marbled meat. Animal mycophagy of Elaphomyces is often just the peridium, which makes E. muricatus more likely to spread spores than E. granulatus. But Alexander H. Smith claimed E. granulatus was the most common truffle of the Northern Hemisphere.

There’s another feature I don’t see on your photos, Herbert. The exterior of the sporocarps are often (usually?) surrounded by a mat-like husk of tree roots. When I have collected E. granulatus on my parents’ farm under Quercus garryana, this mat of roots had to be physically cut through before sporocarps could be seen. Some collectors on one forage, including Dr. Andrew Weil, were surprised to find multiple sporocarps of varying size and diameter in this well-matted root system sometimes 6-10 inches under the soil surface. This layer has also been referred to as mycorrhizal matt community, and helps to stabilize the soil on steep slopes.

Soils poor?
By: Daniel B. Wheeler (Tuberale)
2012-07-18 11:02:55 PDT (-0700)

Mostly sandy and rocky, maybe?

Thank you Daniel
By: Erlon (Herbert Baker)
2012-07-18 10:28:52 PDT (-0700)

The marbled rind in E. muricatus seems to be a defining characteristic that separates the two species from one another. Found under jack pine.

Pinus?
By: Daniel B. Wheeler (Tuberale)
2012-07-18 09:56:16 PDT (-0700)

First photo shows bed of pine needles. Were these found near Eastern white pine?

Created: 2012-07-16 20:16:54 PDT (-0700)
Last modified: 2013-12-04 13:20:35 PST (-0800)
Viewed: 93 times, last viewed: 2015-01-30 23:35:34 PST (-0800)
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