When: 2011-09-15

Collection location: Bremerton, Kitsap Co., Washington, USA [Click for map]

Who: Peter Santerre

No specimen available

These were dried out so it’s hard to tell exactly, but here’s what I have:

Found growing scattered in beauty bark under mature oak trees.
Spore mass brown.
Some rhizoid mass noticible woven into the bark.

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Another point for S. hypogaeum
By: Daniel B. Wheeler (Tuberale)
2012-03-19 23:33:36 PDT (-0700)

would be the extremely thick (even for Scleroderma) of the peridium. I don’t see notice of the thickness in this observation, but in my collection from Paul Bishop Sr.’s Tree Farm near Beavercreek, Oregon, the peridium was 1.5cm thick in places. Most Scleroderma rarely have a peridium exceeding 1cm in thickness. My collections of S. hypogaeum have always been mostly hypogeus with little noticeable rhizomorphs attached, although there were some scattered all over the sporocarps. A curious species to me in that other Scleroderma (S. areolatum, S. cepa) also found on the farm, but not at the same location. Sole S. hypogaeum collection site between rows of Abies grandis (Grand fir) and Pseudopseuga menziesii (Douglas-fir).

Thanks for the insight
By: Peter Santerre
2012-03-19 22:26:30 PDT (-0700)

When they come round again next year, I’ll try to get some better samples.

By: A. Cortés-Pérez (Alonso)
2012-03-19 22:13:07 PDT (-0700)

Scleroderma hypogaeum not always form mycorrhizae with conifers. I have collected S. hypogaeum in oak forest, observation 66322.
The best way to check if it is S. polirhizum is observing the spores.

Alonso -
By: Peter Santerre
2012-03-19 18:42:38 PDT (-0700)

Scleroderma hypogaeum is said to be mycorrhizal with conifers. These were found clustered around old oak trees. There WERE conifers (yew, and cedar mostly) in the vicinity 25+ feet away, so I suppose it’s possible, but there was certainly (to my untrained eye) a real attraction to the oaks.

Certainly Scleroderma at the least, Peter.
By: Daniel B. Wheeler (Tuberale)
2011-09-20 22:08:52 PDT (-0700)

S. polyrhizum needs to be dug from the substrate to demonstrate extensive poly (=many) -rhizum (=roots), all of which would be subsurface. Scleroderma can dry out completely, yet quick rehydrate once some moisture/rain is available. But you almost have to cultivate them as I have to observe that. They are quite easy to grow if that helps.

Unsure on this one, would enjoy input.
By: Peter Santerre
2011-09-15 15:33:52 PDT (-0700)

Forgot to add – largest specimen was about 6cm in diameter.