Spring Truffle forage addendum

dwheeler at teleport.com dwheeler at teleport.com
Sun Mar 30 01:34:03 EST 1997


After speaking to Dr. James Trappe at Corvallis, OR this evening
(3/29/97, it appears that an Elaphomyces species found earlier in the day
(Spring Truffle forage, posted 3/29/97, by dwheeler at teleport.com) may be
a species novum.

The species was found abundantly in clayish soil under Douglas fir about
35 years old, on about 5 degree south-facing slope. While similar to E.
granulatus, it has:

1. _No_ warts on peridium
2. An internal band of tissue between the gleba and peridium which stains
red or carmine immediately after cutting
3. No spores within peridium
4. Abundant rhizomorphs embedded in clay-layer surrounding ascocarp.
5. Black or dark purple spores under 30x
6. Found from 1-6 inches in depth
7. A centralized depression located on top of the ascocarp, which
apparently funnels water into the gleba
8 A hollow (at least in 8 opened specimens) chamber within the peridium,
generally filled with water, whether mature or immature
9 Peridiole-shaped structures, similar to Pisolithus tinctorius, which
line the interior gleba next to the peridium. Many have white veins which
separate spore-bearing areas. These tend to resemble the photograph of
Pyrenogaster sps, shown in Key to Spores of the Genera of Hypogeous Fungi
of North Temperate Forests with special reference to animal mycophagy by
Michael A. Castellano, James M. Trappe, Zane Maser & Chris Maser, on page
100.
10. Spores appear hydrophobic (moving rapidly away from water).

Approximately 25 specimens were collected, possibly of two different
species from the same general locale. All are now on their way to Dr.
Trappe for microscopic analysis and identification.

Daniel B. Wheeler

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