Observation 20472: Austroboletus asper Halling nom. prov.

When: 2005-05-09

Collection location: Carlisle State Park, Victoria, Australia [Click for map]

Who: Roy Halling (royh)

Specimen available

Duplicate specimens are lodged in MEL and NY (Halling #8685)

[admin – Sat Aug 14 01:58:06 +0000 2010]: Changed location name from ‘Australia. Victoria. Colac Otway Shire. Carlisle State Park, W of Gellibrand’ to ‘W of Gellibrand, Carlisle State Park, Colac Otway Shire, Victoria, Australia’


In situ, ambient light.
Spores are narrowly subfusoid and finely ornamented. Ornamentation can be difficult to see with the light microscope.

Proposed Names

-2% (2)
Used references: R. Watling & N.M. Gregory. 1986. Proc. Royal Soc. Queensland 97:97-128.
Based on microscopic features: Spores minutely pitted when observed with proper Light Microscope Optics. It is difficult to see the smooth plage..
56% (1)
Based on microscopic features: After discussion with learned folks in Western Australia and using SEM (scanning electron microscopy), it’s becoming clearer that the Austroboletus imaged here is likely an undescribed species. A. occidentalis has the spore plage with ornament.
84% (1)
Eye3 Eyes3
Based on microscopic features: Spore morphology: spores are narrowly subfusoid (to subcylindrical) and finely ornamented with isolated waarts that are rarely anastomsed, even over the plage. Hypothesis revised.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Walt’s got
By: Roy Halling (royh)
2014-01-17 02:44:57 WIB (+0700)

the vocabulary on it. All the ones I know about (except for A. gracilis), have a reticulated stipe – it can be well-developed and compound or pretty simple.

By: walt sturgeon (Mycowalt)
2014-01-16 09:30:50 WIB (+0700)

The stipe ornamentation could be described as coarsely reticulate or if you want a ten cent word(s), lacerate reticulate.

By: Roy Halling (royh)
2014-01-16 08:20:31 WIB (+0700)

In the initial posting I had an SEM of spores, but it turned out I was confused. More than one macromorphology exists and the spore morphology is different. So, I redacted the erroneous SEM and posted the proper one.

For SEM prep, bits of hymenophore (or a spore print) were scraped onto adhesive disc mounted on metal stubs. These are then sputter coated with gold/palladium (usually). With luck, I can scan and image 3-4 specimens in 3-4 hr on the SEM. Some of my papers describe the M&M involved.

After 9 yr of field work in Australia, we hypothesize that there are at least 14 species of Austroboletus on that piece of real estate. Some described, some not and some only surfaced in Feb 2013.

I hope to post more info shortly. Thanks, Martin!

By: Martin Livezey (MLivezey)
2014-01-16 08:09:44 WIB (+0700)

The SEM photo is totally awesome. I don’t remember you posting SEM before – Is this the first time? ….and are the spores ‘floating’ in something? Maybe a glue to hold them down of other coating? Also, is there a twenty dollar word for the deep reticulation on the stipe? There should be.

Created: 2009-04-22 23:42:17 WIB (+0700)
Last modified: 2014-01-16 02:20:17 WIB (+0700)
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