Observation 64256: Oligoporus obductus (Berk.) Gilb. & Ryvarden

When: 2011-03-08

Collection location: Samuel P. Taylor State Park, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

Specimen available

These were growing on an old mossy stump in a mixed hardwood area.
They were somewhat petal-like with short flattened stems, each petal around 2-3 cm wide and stems around 2 cm.
They were tough-spongy and the caps were almost suede-like.
The pores were fairly small,~ 2-3 per mm.
The spore were white and small, ~4.0 X 2.0 microns and almost oblong but one end tapering.
I don’t believe the spores were amyloid but I could only test them with a Iodine-KI solution.
The cap surface hyphae seemed to have long hair-like strands(trichoderm?).
The taste seemed mild.
So far no luck in finding a match in the Tyromyces, Oligoprus or Spongiporus references that I’ve searched.

Proposed Names

29% (1)
Recognized by sight
61% (2)
Eye3 Eyes3
Used references: D.A. of MD

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Darvin DeShazer (darv)
2011-03-11 22:57:08 CST (-0500)

It also keys to Oligoporus obductus in Gilbertson & Ryvarden, North America Polypores, but the size of your spores do NOT match. They should be 5-6.5 × 2-2.5 µm.

Created: 2011-03-10 22:00:37 CST (-0500)
Last modified: 2011-03-12 05:03:27 CST (-0500)
Viewed: 133 times, last viewed: 2017-12-08 21:32:26 CST (-0500)
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