Observation 197645: Octaviania tasmanica (Kalchbr. ex Massee) Lloyd

I believe this maybe Radiigera (196646). Fungi found in loose forest soil and leaves, scraped up by forest foragers/feeders. Area Eucalyptus and Semi-Rain forest. Recent rain fall and damp soil. Area is an open shaded area close to a fresh water stream.

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Comment Courtesy Heino Lepp.


This is a specimen of Octavianina tasmanica, with an abundance of Sepedonium present as well. In the photo (mounting fluid is KOH) I show Octavianina spores (brown with the robust spines) taken from within the gleba and the large, golden yellow Sepedonium chlamydospores or aleurioconidia taken from a yellow patch of the ‘peridium’. That white/yellow ‘peridium’ is a dense cover of Sepedonium over the Octavianina, with mature aleurioconidia in the yellow areas. In the white areas there are both the thin-walled, elongated ellipsoidal dispersal conidia but also masses and masses of immature, hyaline aleurioconidia. The mature aleurioconidia are around 20 mu in diameter.



By: Daniel B. Wheeler (Tuberale)
2015-02-02 02:38:57 CET (+0100)

is odd, Ian. It appears to have at least 3 layers to it. And there are darn few fungi with 3-layer peridiums. That would seem to indicate, perhaps, something related to Geastrum. Radiigera are related to Geastrum, but have only 2 layers: the outermost a scant hairy or felty area, the inner a thick (2-3mm minimum) layer which is often the preferred layer for mycophagists (fungal eaters).

This observation appears to have a sterile outer layer peridium, mostly white but with yellow stains or areas; the inner layer is similar (sort of) to some Elaphomyces in that it has (or may have) embedded spore pockets; the final inner-most layer is again mostly white white yellow spotches, or sometimes a completely yellow area. Once again Radiigera are similar, but don’t have that many layers to their peridium.

More importantly, the gleba of Radiigera has a capitate columella, which looks like a vestigial stipe embedded within the fungus. Radiigera is named for the radiating rays between the peridium and the capitat columella.

This fungus has interior (sterile?) veins within the gleba, separating smaller packets of (spore-bearing?) dark pockets, mostly globular. There are also some small chambers without spores or veins within the gleba.

Obs. 196646 has a capitate columella in the center of the fungus. This lacks that feature. Further the radiating lines are visible which are absent in this obs.

I for one will be very interesting in what this turns out to be. I still believe you have found something new here.


I always search this area for “other” hidden little treasures. I have dried this specimen and with several other similar finds will be sending them to Heino Lepp at Canberra Herbarium in the next few days. (for examination). hopefully he will be able to put some more light on the fungi types. I will with his permission load his findings as they become available to me. The variable “exposures” seen in the images was due to the clement weather conditions and varying low light.

While it
By: Daniel B. Wheeler (Tuberale)
2015-02-01 19:14:34 CET (+0100)

has the thick peridium of Radiigera, it lacks the radiating rays from a capitulate columella (which I don’t see either).

May be species and genus novum, Ian. Take as many pictures as possible. Get more specimens if possible.

Created: 2015-02-01 12:03:29 CET (+0100)
Last modified: 2015-06-24 11:28:07 CEST (+0200)
Viewed: 71 times, last viewed: 2018-03-23 09:11:32 CET (+0100)
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