Observation 45275: Solioccasus polychromus Trappe, Osmundson, Manfr. Binder, Castellano, & Halling

I am grateful to Jim and Mike for their expertise. The spores are yellowish and smooth. The odor is very similar to northern hemisphere gautierias that I have smelled. Also, the cartilaginous appearance and texture of the specimens were very much like a Gautieria.

Species Lists


Unearthed from sand and imaged in situ.
Close up of exterior.
Basidiospores 40x with Nomarski DIC.

Proposed Names

56% (1)
Used references: According to Jim Trappe and Mike Castellano, this is an undescribed genus known from far northern Australia and Papua New Guinea. The name offered here is the one that Jim and Mike use when referring to that taxon. I am grateful for their expertise.
84% (1)
Eye3 Eyes3
Recognized by sight: The specimen in this observation posted 3 years ago, is part of the protologue describing this formally for the first time. A preliminary version is posted In Press as of 24 May 2013 on the Mycologia website.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
RE: Bothia
By: Roy Halling (royh)
2013-05-29 14:05:35 EDT (-0400)

I urge all who are interested to please read the text and caveats regarding the phylogenetic inference in the Materials & Methods section. Based ONLY on the unambiguous, alignable portions of the nrLSU locus in THIS analysis, Solioccasus is monophyletic with Bothia.

Any genetic work?
By: Christian (Christian Schwarz)
2013-05-29 12:40:08 EDT (-0400)

The interior doesn’t look much like the Gautieria I’ve seen in northern CA, but that was only a handful of species.

The smooth spores with a clear hilar appendage are interesting.

At last
By: Roy Halling (royh)
2013-05-29 12:31:19 EDT (-0400)

this “Sunset Truffle” will be formally described in an upcoming issue of Mycologia later this summer. It is in press at the moment and a preliminary version is available at the Mycologia website:

By: Roy Halling (royh)
2010-05-13 09:37:30 EDT (-0400)

didn’t enter the conversation. I’ve collected that genus once or twice in Australia. As I recall, the spores have ridges as well. The ones in this Obs. are smooth. Thanks.
BTW, Jim T. et al. has a working manuscript in which the gen. et sp. nov. will be described, but probably not until alter this year. This false truffle has also been collected in the Northern Territory, Cape York in Queensland, and Papua New Guinea.

I saw somewhere, possibly the lab at Oregon State
By: Daniel B. Wheeler (Tuberale)
2010-05-13 08:59:29 EDT (-0400)

that Australian Gautieria-like fungi were being tentatively called Austrogautieria. Did either Jim or Mike mention or suggest that name?

By: Michael W (Michael Wallace)
2010-05-10 19:27:22 EDT (-0400)

Very interesting Roy, I have been finding one for the last few years here that is a golden yellow colour, it has quite a strong odor that I find difficult to describe, it is found half buried in soil under tree ferns, I have never been able to identify it.

I love the DIC microscopy image!

Associated with
By: Roy Halling (royh)
2010-05-10 15:14:29 EDT (-0400)

Eucalyptus sp. (aka scribbly bark gum). Please note that it is not a true Gautieria, whose species are only northern hemisphere as I recall, and have longitudinal ridges. This beast has smooth spores as noted in the observation and 3rd image.

very cool technicolor truffle!
By: Debbie Viess (amanitarita)
2010-05-10 14:33:58 EDT (-0400)
Host species?
By: Daniel B. Wheeler (Tuberale)
2010-05-10 14:33:58 EDT (-0400)

Often find Gautieria with Douglas-fir locally. Usually during warmer months of the year here: now thru September. Bet there’s few Douglas-fir in Queensland, though.

Created: 2010-05-10 13:58:39 EDT (-0400)
Last modified: 2013-05-29 12:17:52 EDT (-0400)
Viewed: 498 times, last viewed: 2018-04-20 15:10:49 EDT (-0400)
Show Log