Observation 49284: Boletus rubropunctus Peck

When: 2010-07-20

Collection location: Seven Mile Lake Trail, Forest Co., Wisconsin, USA [Click for map]

Who: Steve Nelsen (sfnelsen)

No specimen available

Boletus sp. This looks to me like what people in the Northstate Mycological Club, based in St. Germain, which is about 50 miles North and West of where we were collecting, call ’Jana’s bolete’. It was identified by Nancy (Smith) Weber, who once visited this club, as Boletus sphaerocystis Smith and Theirs, which was seen once in Ann Arbor by Smith, and published in their 1971 monograph. I did not, however, check these for the sphaerocysts of its name. It looks like subglabripes. Cap 5.5 cm, stem x11 mm at apex. ’Jana’s bolete’ is very common in the St Germain area, and eagerly sought for eating by the club members. They do not do microscopy on it.

[admin – Sat Aug 14 02:05:53 +0000 2010]: Changed location name from ‘Seven Mile Lake Trail, Forest County, Wisconsin, USA’ to ‘Seven Mile Lake Trail, Forest Co., Wisconsin, USA



Proposed Names

26% (2)
Recognized by sight
28% (1)
Recognized by sight: Overall appearance
55% (1)
Recognized by sight: after seeing lots of it this past weekend, some with a red puntate stipe, some without… this seems to fit well.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Looking for sphaerocysts
By: Steve Nelsen (sfnelsen)
2010-07-30 12:09:31 PDT (-0700)

I wrote Cora Mollen, the mainstay of the Northstate Mycological Club. She said there were not many boletes up there yet, and that the photo indeed looks like what they call ’Jana’s bolete’. They plan to try to figure out whether they are picking mostly sphaerocystis or subglabripes, which it strongly resembles macroscopically. So far this year, they have not found any sphaerocysts on their ’Jana’s boletes’. Since B. sphaerocystis had only been found once in Ann Arbor before Nancy’s visit to St. Germain, it was off everybody’s radar, and people have not been looking to see if their subglabripes is really sphaerocystis. At least near St. Germain, it sometimes is.

B. subglabripes?
By: I. G. Safonov (IGSafonov)
2010-07-28 11:52:40 PDT (-0700)

Apart from the strange stipal discoloration afflicting the specimen on the left, I would call this collection B. subglabripes, too.

Created: 2010-07-28 09:58:04 PDT (-0700)
Last modified: 2016-04-23 11:01:23 PDT (-0700)
Viewed: 134 times, last viewed: 2018-11-22 16:48:30 PST (-0800)
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