Observation 10486: Calvatia boninensis S. Ito & S. Imai

When: 2008-09-06

Collection location: Japan [Click for map]

Who: forestwander

No specimen available



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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Just visited Tokyo mushroom website
By: Daniel B. Wheeler (Tuberale)
2008-09-09 23:25:19 BST (+0100)

Of the four species listed, C. boninensis is the most likely. But there are variations. The stipe is mostly equal on C. boninensis, but on your mushroom there is a strong taper from the gleba to the base of the stalk. While at least one of the mushroom shown at the website also appears to be be tapering, 2 do not. Also, the cap of the specimens shown at Tokyo mushroom website appear with fine ridges, which your photos do not have. I have seen such ridges in some local specimens after drought, but you don’t mention anything about dry conditions. It is possible you have a new species. Please collect and dry 1 or 2 specimens next time: it might be named for you.

By: forestwander
2008-09-09 08:44:15 BST (+0100)

B. Venenatus was first guess. I needed some assistance. Thanks everybody. I think I have come close with your assistance. Please see the website I have used. Douglas, thank you for agreeing with me. But because B. Venenatus is regarded as quite rare, and usually found in high altititudes, I will stick with Calvatia. As this specimen was found only 10-30 meters above sea level. Literally across the road from the ocean. And I did not keep specimen.

Compared to leaves…
By: Douglas Smith (douglas)
2008-09-08 20:17:31 BST (+0100)

These look pretty large (ish?). but without more info here, it is fairly uncertain. These need to be found again, and photo taken of one cut in half at least, or guesses at names and genera here isn’t going to go anywhere really.

Ref. points
By: Daniel B. Wheeler (Tuberale)
2008-09-08 19:37:00 BST (+0100)

I see no bluing on the cap which is supposed to be present on B. venenatus. The stipe appears mostly equal on the reference, but is tapering on the photos. While no interior is shown, the presence of gills versus gleba would be conclusive. There is little in the photo to give a size reference, but according to the reference, B. venenatus is quite large.

Look at the ref. I think
By: Douglas Smith (douglas)
2008-09-08 16:23:07 BST (+0100)

From the ref. link, I think these are Boletes that have a veil, and they grow pretty big before the veil breaks. Which seems weird for a Bolete, but this is Japan. Need more info on Japanese Boletales to tell I guess.

Not Boletus
By: Daniel B. Wheeler (Tuberale)
2008-09-08 08:57:23 BST (+0100)

Cannot be Boletus without tubes under the cap. I don’t see any.

Created: 2008-09-06 11:10:00 BST (+0100)
Last modified: 2008-09-06 11:10:00 BST (+0100)
Viewed: 92 times, last viewed: 2018-11-21 13:20:18 GMT (+0000)