Observation 171046: Rhizopogon Fr. & Nordholm
When: 2014-07-21
(57.5442° -111.1894° 304m)

Notes:
Truffle
Sparsely vegetated Jack Pine (Pinus banksiana) forest, no other tree species present
Lots of brown Russulas on site, also blueberry (Vaccinium myrtilloides)
Was emerging from soil (poking up a bit)
About 5cm long
Inner texture like a fine foam sponge, and somewhat squishy like one too

Proposed Names

28% (1)
Recognized by sight
28% (1)
Used references: Arora, Mushrooms Demystified. From that source on p. 748: “…peridium light brown to ark yellow-brown or maroon-brown.” Most Chamonixia have a columella, but the specimen may have to be sections across the base to see it. Also from p 751 in Arora “C. caudata has a yellowish-brown to brown or marroon peridium and a short whitish stalk, but does not stain blue; it occurs under oak an other hardwoods in California and Oregon.” In Oregon Jack pine would be a synonym for Lodgepole pine (Pinus contorta). While it is possible that this is not the same species, it may be the same thing, but being found at its’ extreme southern range. Even in the US, this is an uncommon fungus. The peridium is marroon-brown, which is a very uncommon color among hypogeous fungi.
45% (2)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Thanks
By: Chris Hay (hayfield)
2014-09-21 08:18:06 CDT (-0400)

Noah – Rhizopogon was the name I was looking for but forgot (thank-you!)

Tuberale – thanks for the idea. I looked up the Arora reference. The habitat definitely does not match (northern Alberta boreal pine forest vs oaks in California). Some aspects of the morphology fit (colour)…. the shape was more knobby/ potato-like than pear or cushion shaped. Sorry I didn’t cut it up in other directions to find a columella. I’m sure you know more on these tuber types than me; I find them baffling.

Other notes:
The skin and inside colour definitely darkened since picking and letting it sit on a windowsill. Part of it was maggot-infested and had to be removed. Some of the outside had a few rhizomorphs (?) sort of mycelial thread vein-like lines, particularly near the base. This seems to match well with photos of Rhizopogon. I tried to match the photo frame colour with the brown the fb turned, but it’s one of those brown colours that’s hard to pin down.

Created: 2014-07-23 18:42:17 CDT (-0400)
Last modified: 2014-09-21 08:03:27 CDT (-0400)
Viewed: 34 times, last viewed: 2016-09-15 10:53:20 CDT (-0400)
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