When: 2007-12-01

Collection location: Albion, Mendocino Co., California, USA [Click for map]

Who: Douglas Smith (douglas)

Specimen available

Ok, these took a couple hours to id. It was during the lab time of the bio 800 course at SFSU. The id was mostly confirmed by Dr. Desjardin as part of this lab time.
For the id, we used the 1956 monograph of NA Gymnopilus, by Hesler.

The main features are the smooth orange-brown cap, and the dark smooth stipe without any veil. Also there are the warted spores, which are 7.5 × 5.4 um, on 7 spores measured. The shape of these with the pointed tear-drop closely matches the drawing for this species. In the monograph, the features match well either G. liquiritiae or G. croceoluteus (and there is some mention of G. oregonesis), and says that G. liquiritiae is the “common” species, with samples seen from many places in NA, including CA. But that the feature that separates the species is the “interwoven pileus trama”. This can be seen in the third photo. This is a “crown section”, taken from a thin slice on center top of the pileus, but the interwoven trama was confirmed from radial and marginate sections also. The trama tissues here can be seen to be randomly aligned, and interwoven. G. liquiritiae should have radially aligned pileus trama tissues.

The NW key concil for Gymnopilus mentions both these species, and has some feature that separates them. But until I start finding G. liquiritiae, I can’t really say how closely these are related, and how the feature might differ.

These were dried and placed in the SFSU herbarium for further study in the future.

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Add Comment
By: Richard Kneal (bloodworm)
2012-08-05 11:14:28 MDT (-0600)

3-8 cm just looked a bit big to me.
i guess the spores are slightly inequilateral…
i guess my main concerns are the cap margin and stipe coloration.
however, now that i know it was growing on D. fir, i can understand the logic a lot more.

By: Douglas Smith (douglas)
2012-08-05 10:56:28 MDT (-0600)

Went over the Hesler monograph to get this, for some time. The 3-8 cm sounds about right, what is the problem there? The spores look very close to spot on from the Hesler monograph to me. Hesler didn’t collect in California, but he reports G. croceoluteus from Idaho, as a western species.

These were growing on D. fir, which is a conifer. What source are you using for Gymnopilus id?

G. croceoluteus…
By: Richard Kneal (bloodworm)
2012-08-05 10:31:09 MDT (-0600)

is said to have a pileus of 3-8 cm with an inrolled margin.
also, the stipe is pallid yellowish or orange-buff.
G. croceoluteus is also not reported from California…
what type of wood was this growing from?
croceoluteus is known to grow from conifers.
the spore shape also looks off to me for G. croceoluteus.