Observation 76351: Pseudoinonotus dryadeus (Pers.) T. Wagner & M. Fisch.

When: 2011-09-14

Collection location: Redwood Rd., Napa, California, USA [Click for map]

38.0° 122.0°

Who: Steph Jarvis (Steph Jarvis)

No specimen available

Fruiting body seems perennial, only because of it’s size. The owners of the property say it propped up in July for the first time on this very old and large Live Oak (although this species grows on conifer in the west coast and oak along the east coast). This species is known to be annual and not perennial, according to D. Arora. The sporocarp is fan shaped, 16 – 20 inches broad, This is a large fruiting body, with 5 o 6 other shelves, just as large or a bit smaller. This sporocarp is at least 3-6 inched thick at the attachment. Margin is round. The surface is soft, spongy, wet, corky inside. Most likely a hard crust when it dries out. The upper surface is a tan, buff beige color. It is COVERED in enzymes that it is bleeding out of an amber, umber, dark brown color. The inner mass is a deep chocolate brown of a fibrous, wood-like layered tissue. Currently it is soft, corky. This inner and outer layers all darken with KOH, at first redish brick dark red turning black in a short time.

the pores are roughly 408 per mm. Yellowish, green, olive green color. Uneven coloring. The pore surface easily rubbing off. No Immediate change with KOH, some reddening, but not evenly and with manipulation.

Immature, round to oblong and eliptical. About 4×4um to 4×2um. Most still attached to basidia. I need to go collect them again in a month.

Can anyone tell me about the pathogen properties that this fungi is putting on the tree?



Proposed Names

54% (1)
Recognized by sight: see notes below
Based on microscopic features: Spores are immature, but starting to elongate, eliptical and about 4um x 2 um, or 4×4.
81% (1)
Recognized by sight: most current name

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2011-09-14 23:42:41 EDT (-0400)
Last modified: 2012-08-03 14:52:09 EDT (-0400)
Viewed: 94 times, last viewed: 2018-03-26 20:45:08 EDT (-0400)
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