Observation 25242: Tuberales sensu lato

When: 2009-09-14

Collection location: Norco, California, USA [Click for map]

Who: Don R. Reynolds (capnodium)

Specimen available

Basidiocarp: up to 7 cm
Gleba: brown
Basidiospores 3 µm, finely echinulate

The specimens are covered with spores and some soil. The outer surface is pale and punctate.

[admin – Sat Aug 14 02:03:49 +0000 2010]: Changed location name from ‘Norro, Orange County, CA’ to ‘Norco, California, USA

Species Lists



Proposed Names

-55% (3)
Used references: various
Based on microscopic features
-14% (2)
Used references: Arora’s Mushrooms Demystified, p. 748, keys out to couplet 11. Requires seeing a cross-section to determine whether columella present or absent. Radiigera also not a possibility, as the spores in the description are too small. Very curious collection. Would like to see more photos, especially cross-section, which could rule out several more possibilities, or give a positive indication of what it is.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Either that is a child’s foot in the photo
By: Daniel B. Wheeler (Tuberale)
2009-09-17 13:57:29 CDT (-0500)

or this is over 7cm.

If spore size 3 microns as given
By: Daniel B. Wheeler (Tuberale)
2009-09-17 13:47:35 CDT (-0500)

cannot be Scleroderma, Elaphomyces, or Pisolithus.

Photo 56798
By: Daniel B. Wheeler (Tuberale)
2009-09-15 21:37:24 CDT (-0500)

Just blew up the photo above, and could see reddish-brown spore-mass just underneat what appears to be a peelable peridium, seen on specimen furthest to the left. Also visible is mostly hypogeous, put partially epigeous sporocarp near center of photo. I suspect these could actually be Pisolithus, although I have never personally seen so many sporocarps in a single location before, nor have I seen Pisolithus mostly hypogeous. Also Pisolithus should have a mostly sterile base and a basal attachment of rhizomorphs visible in especially young specimens. If Pisolithus, the base of at least some of these sporocarps should be visible, but I don’t see them.

Re: Radiigera
By: Daniel B. Wheeler (Tuberale)
2009-09-15 21:29:50 CDT (-0500)

rather large for that genus in my experience. But a cross-section would certainly prove or disprove that possibility. Both Radiigera and Scleroderma have thick peridiums. The center of Radiigera radiates outward from a central point, with individual radii often enclosed in separate radii, or ray-like stars. In maturity, such radii are dark brown or black spore masses, but when immature can be whitish or off-white. Only when mature spores are present can positive identification be made.

Specimens seem quite large, no matter what they prove to be.

Cross section to test my guess – Radiigera.
By: Christian (Christian Schwarz)
2009-09-15 18:06:41 CDT (-0500)
Question Scleroderma
By: Daniel B. Wheeler (Tuberale)
2009-09-15 17:10:00 CDT (-0500)

I don’t think these are Scleroderma, although they might be something similar. Please slice one open and include a photo of the interior of the sporocarp. Much larger than most Scleroderma I’ve seen personally, and the majority of Sclerodermataceae are epigeous rather than mostly hypogeous. There is usually at least some orange in the peridium of most Sclerodermas, as well as a thick-white peridium (skin) to the outer surface. If there are spores mixed in with the outer surface, it almost guarantees it is not a Scleroderma … UNLESS it happens to be S. hypogaeum, which is relatively seldom collected. Outer peridium does not look like Scleroderma to me, but need a photo of a cross-section of the sporocarp to be able to suggest an alternative.

Created: 2009-09-14 12:38:11 CDT (-0500)
Last modified: 2012-03-14 17:35:49 CDT (-0500)
Viewed: 131 times, last viewed: 2017-06-06 02:39:46 CDT (-0500)
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