Observation 48228: Setchelliogaster
When: 2010-07-07
No herbarium specimen

Notes: Found growing in fine leaf/wood litter under Acacias.

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Comments

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Wattle
By: TimmiT
2011-07-05 06:23:52 CDT (-0400)

I’m a bit late to the party but the wattle is Acacia dealbata (Silver Wattle).

Photos added
By: Lord Mayonnaise
2010-09-22 10:41:11 CDT (-0400)

of the environment they were found in.

Any help identifying the acacia would be greatly appreciated.

Regardless of what this turns out to be, FANTASTIC PHOTOS!
By: Daniel B. Wheeler (Tuberale)
2010-07-08 02:52:14 CDT (-0400)

The expanded caps seem to mostly have an abruptly bulbous base that I don’t see in the unexpanded caps. Perhaps this has been described as 2 species in the past. The expanded specimens show gills which have grown together as well as some cross-hatching: traits I associate with transitional stages of a fungus going from either a hypogeous habitat to an epigeous habitat, or vice-versa.

The confusing (to me) complex of Russula/Macowanites, which sometimes are fully hypogeous, and other times fully epigeous; sometimes with gills which have grown together and occasional cross-hatching, or with such convoluted gill structure that any free-falling spores would have difficulty falling far away from the fruiting body. Macowanites has a strong aromatic component which may attract animals or other ambulatory organisms to dine on them. Leucogaster citrinus similar has an extremely attractive odor to me, similar to coconut and chocolate.

In Thaxterogaster pinquis, the only species of Thaxterogaster I have any experience with, the aromatic components are not at all pleasant to my nose, quite gaseous and very unpleasant smelling. But apparently they are attractive to slugs.

Dr. Helen Gilkey, my botany professor at OSU, said no one can definitively state which came first, the epigeous or the hypogeous. All that is certain at this time is that some hypogeous fungi, like Hymenogaster and Hysterangium, have rudimentary stipes or columellas. These are either the remains of vestigial stipes or the beginning of stipes: it is to be hoped that DNA analysis will eventually sort out which genus is going in which direction. But certainly this is evolution happening now!

Perhaps Michael W is correct: both collections are actually the same species but with different form. I hope to live to see such questions resolved. If both forms actually did have the same DNA, for example, what caused some to not expand? Another reason for saving any future fruitings of BOTH these fungi.

.
By: Michael W (Michael Wallace)
2010-07-07 19:21:10 CDT (-0400)

The genus Setchelliogaster is a subagaricoid genus that is an intermediate form that falls between the agaricoid genus Descolea and the hypogeous genus Descomyces.

I think Setchelliogaster being a subagaricoid form has the ability to form fully expanded fruit bodies but the basidia have probably partially or completely lost the ability to forcefully eject the basidiospores, I suspect all of the specimens you have collected are of the same species, it will be interesting to hear if the expanded specimens are sporulating like normal agaricoid forms or not.

A comparison of the microscopic characters of these specimens should be done to see if they may be all of the same species and the location should be visited often to document the stages of growth.

I’d be very interested in learning both species shown.
By: Daniel B. Wheeler (Tuberale)
2010-07-07 10:24:06 CDT (-0400)

Setchelliogaster in Australia normally would be expected with eucalypts rather than with acadia. I have never found it, just read about it. (So many mushrooms are that way!) Setchelliogaster tenuipes seems a reasonable extension of what has been found in Australia, but few collections exist from there. I believe that Dr. Teresa Label would be the authority to contact for an identification if you are really interested.

Very interesting that you found two similar fungi within the same square meter. Suggests there might be a relationship between the two, as well as both being mycorrhizal.

Mixed fungi
By: Lord Mayonnaise
2010-07-07 07:51:23 CDT (-0400)

I didn’t realise I found two kinds of fungi here. They were all growing within an area of a meter. I was trying to find different stages of growth but I couldn’t really find any specimens that showed the transition between a semi-open cap and a fully open one.

Setchelliogaster tenuipes which is found in Australia is described having a cap that doesn’t expand fully. (Thanks Karode13).

A wild guess…
By: Dimitar Bojantchev (dimitar)
2010-07-07 01:01:13 CDT (-0400)

Could be Thaxterogaster sp., but without a touch of micropscy it is a wild guess whether it is even Cortinariaceae. The color of the mature gill does look like it.

D.

Created: 2010-07-07 00:36:02 CDT (-0400)
Last modified: 2014-06-25 06:25:58 CDT (-0400)
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