Observation 165394: Gymnomyces Massee & Rodway
When: 2014-05-15

Notes: Small round white ball shaped growth found beneath the surface when examining another fungi in close proximity. (May be Lactarius, or Thaxterogaster.) The local area, although semi rainforest, also supports many varieties of Eucalyptus.

Proposed Names

28% (1)
Recognized by sight
63% (2)
Eye3 Eyes3
Used references: NATS Field Guide To Selected North American Truffles and Truffle-like Fungi. This genus is more likely to have a white peridium when young, and bruises brown both exterior and interior.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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You’re welcome, Ian.
By: Daniel B. Wheeler (Tuberale)
2014-05-19 18:14:24 MDT (-0600)

There are other options still. Please don’t take my comments as the only possibilities.

Since most of these fungi are mycorrhizal, it helps to know any nearby trees. This could narrow the field … a lot.

Daniel

Thank you for your excellent and informative comments. A point that I missed that you have mentioned, is that after I bisected the specimen, a discolouration commenced, but at a slow rate which I only noticed in the images taken, and later viewing. I did think at the time it may have been bruising, or some kind of oxidation effect when exposed to the habitat. From what you have described and the most likely direction for an ID, I have to go with your suggestion of "Gymnomyces ". Area supports many varieties of Eucalyptus. As soon as I can, I will do some micrographs and load the results to the MO obs. file. Thanks again for your great deliberation and comments. kk

Columella or
By: Daniel B. Wheeler (Tuberale)
2014-05-19 11:21:17 MDT (-0600)

a pseudostipe.

Stipe is fully developed, but surrounded by gleba. I think either term fits here.

Looks promising for Gymnomyces or Macowanites, Ian. Both can have pseudostipe, but Gymnomyces is more likely to have brown staining.

If obs. found in close proximity to Eucalyptus, could be a form of Hydnangium: not Hydnangium carneum, though. Hydnangium c. is related to Laccaria mushrooms, can have a columella, and is usually pink inside and out. (Source: NATS Field Guide To Selected North American Truffles and Truffle-like Fungi)

To separate between these species, would need to see microscopy of spores. Not a bad idea anyway for hypogeous species.

Comments please.

Although this was beneath the surface, I don’t think it fits in the “Truffle” category. It was not solid or heavy enough in my opinion. All comments appreciated. Have found something similar in MO Obs 162780. May be Thaxterogaster has a columella (interior stem) or vestigial stipe and this has an unusual odour.

Created: 2014-05-17 07:23:20 MDT (-0600)
Last modified: 2014-05-19 17:03:08 MDT (-0600)
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