Observation 64007: Onnia circinata (Fr.) P. Karst.

When: 2011-02-12

Collection location: Salt Point State Park, Sonoma Co., California, USA [Click for map]

Who: Adam Singer (adam)

Specimen available

This specimen was found during David Campbell’s WAMS foray to Salt Point State Park. It was not found by me, but from the 2 blade pine needles attached to the specimen, it was found amongst conifers. Since I was unfamiliar with the genus Inonotus, I originally thought it might be a young Phaeolus schweinitzii. At the MSSF meeting the Tuesday after David’s foray, Dr. Fred Stevens suggested it might be an Inonotus. He then took a piece of it and later emailed me to confirm that it is indeed an Inonotus and that it is I. circinatus, notable for the hooked tips.

I’m including a few photographs I took and one that Dr. Stevens took of the setae.

MO tells me that Inonotus is deprecated and that the correct name is now Onnia circinata – guess I never got the memo…. But it seems odd to me that with either genus name, I see no other observations here on MO for circinata. Here is the Species Fungorum synonymy list:

My notes: cap matte but not quite tomentose, soft light brown, wavy. Cap context a rusty brown. Pore surface white, many of the holes are “stuffed” / filled in. Some pores near the base are brown with only smatterings of white around the rims. Found in 2 needle pine.

Species Lists


Copyright © 2011 Dr. Fred Stevens
photo taken by Fred Stevens

Proposed Names

82% (1)
Recognized by sight: Recognized by Dr. Fred Stevens
Used references: 1. http://www.svims.ca/council/Polypo.htm#n64a
2. Mushrooms Demystified p. 570 (comments section for I. tomentosus)
Based on microscopic features: per both PNWKC and MD distinguishing feature is that the setae have hooked tips (circinate)

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

= Observer’s choice
= Current consensus


Add Comment
By: Christian (Christian Schwarz)
2011-05-18 15:28:59 MDT (-0600)

I want to look for hooked setae now. They’re kind of terrifying, actually.

Created: 2011-03-01 15:55:18 MST (-0700)
Last modified: 2011-03-01 16:40:30 MST (-0700)
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