Observation 92414: Scleroderma Pers.

When: 2012-04-09

Collection location: Paso Nogales Park, Pleasant Hill, California, USA [Click for map]

Who: Debbie Viess (amanitarita)

Specimen available

growing in sandy soil along trail, near mixed oak woodland.


developing fertile tissue in center.
middle example shows top of flattened cap.
400x in water. spores embedded in fungal matrix.
1000x, in water. spore in space.

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight: very thick skin, purplish solid spore mass, pseudo-rhiza.
Based on microscopic features: spores distributed randomly through gleba, maturing at different rates.
oddly shaped spores: rounded, kinda, but collapsing and oddly ornamented.
I didn’t see spines. maybe a reticulum.
-5% (2)
Recognized by sight: Extremely thick sterile base, sandy soil, lengthy pseudostipe extending into soil and covered with sand.
Used references: How to Know the Non-Gilled Mushrooms, by Smith, Smith and Weber. Description indicates usually yellowish peridium, but color changes can occur in dehydration. Spores should be reticulate with ornamentation up to 2 microns long.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
True. Compared to Michigan, Massachusetts and Florida
By: Daniel B. Wheeler (Tuberale)
2012-04-11 10:21:04 PDT (-0700)

our material doesn’t look the same macroscopically.

Some of our material can have a sterile base nearly 1.2 cm thick, though. The thickness of the peridium overall, plus the spore size should give a good match. The only other very thick-skinned Scleroderma to my knowledge is S. hypogaeum, which often is completely hypogeous as well.

While not found in many keys, the thickness of the peridium and the especiallly thick sterile base is the key here.

Alternatively, you may have a species novum.

not a good match with other postings of that species here…
By: Debbie Viess (amanitarita)
2012-04-11 08:35:44 PDT (-0700)
Not well known from the West Coast.
By: Daniel B. Wheeler (Tuberale)
2012-04-11 08:31:14 PDT (-0700)

More frequently found in the Great Lakes and Eastern coastal areas. Extremely thick sterile base plus pseudostipe composed of thick, ropey rhizomorphs very suggestive. I have found something similar to this. Spores should be (9) 10-14 (16) microns in diameter. Originally described with “golden yellow” peridium. I have found Scleroderma parasitized with golden yellow fungus, and suspect the original collection may be parasitized. Peridium more frequently dull brownish. Extremely thick sterile base often persistent after spore mass has been blown away.

Approximate thickness of sterile base?
By: Daniel B. Wheeler (Tuberale)
2012-04-10 21:53:46 PDT (-0700)

Over 3mm?

Created: 2012-04-10 20:32:45 PDT (-0700)
Last modified: 2012-04-11 08:34:48 PDT (-0700)
Viewed: 138 times, last viewed: 2017-06-12 19:30:26 PDT (-0700)
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