Observation 168201: Amanita sect. Caesareae Singer

When: 2014-06-23

Collection location: Japan [Click for map]

Who: shinto

No specimen available

did not have camera in field, so collected it and staged the pictures . Found growing today at a park in deciduous leaf litter. some kind of amanita?, with its cup base and all.



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If you get the opportunity to split a specimen from top to bottom…
By: R. E. Tulloss (ret)
2014-06-26 05:36:33 CEST (+0200)

right down the middle of the stem, I think you will see that the stem has no bulb at the base. The volva itself is large and probably quite fleshy; however, inside [if I am correctly guessing that this is a species of sect. Caesareae, the stem will have no bulb but will smoothly increase in width slowly from top to bottom. A razor blade or a very sharp knife will make the splitting of the mushroom easier to carry out.

Very best,


By: shinto
2014-06-26 04:28:41 CEST (+0200)

thanks for the education on this. The cup base is a little different. Please look at my follow up field pictures of more specimens. There is an umbo on some of them.

Ama;nita subjunquillea probably does occur in your area.
By: R. E. Tulloss (ret)
2014-06-26 02:43:44 CEST (+0200)

However, this cap has a striate cap margin. This is a vary rare occurrence in sect. Phalloideae except in very small or old specimens. The distinctly striate cap margin and a pigmented cap with a partial veil would point to section Amanita if there were a distinct bulb at the stem base or section Caesareae if the stem has a sack-like volva containing a stem that lacks a true bulb at the bottom (a “totally elongating” stipe). Many species of the Caesareae have an umbo (although that is not always true). Amanita subjunquillea would appear to have radially-oriented hairlike fibers embedded in the cap surface (a results of the pattern of pigment).

Because I cannot see the complete volva, I am making a guess that it is roughly cylindric and encloses a bulbless stipe base. From what I can see, I think this is likely.

Very best.


I thought it might be Amanita subjunquillea.
By: shinto
2014-06-26 00:36:08 CEST (+0200)

this is supposed to be a common and deadly amanita throughout asia and japan. It’s not on the M.O. list. Perhaps there is some overlap in classification.

I think that this species would be close to Amanita javanica in the sense of Japanese…
By: R. E. Tulloss (ret)
2014-06-23 13:52:53 CEST (+0200)

authors; however, the lack of orange tint in the yellow cap seems to segregate the species in the images from the true javanica.

Hello, Shinto. Do you ever dry specimens for later examination?

Very best,

Rod Tulloss

Created: 2014-06-23 07:54:44 CEST (+0200)
Last modified: 2016-03-08 00:19:14 CET (+0100)
Viewed: 34 times, last viewed: 2017-06-18 15:37:41 CEST (+0200)
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