Observation 186517: Bolbitius titubans var. olivaceus (Gillet) Arnolds
When: 2012-12-14

Notes: Voucher Number: NAMA 2012-255 ; Bolbitius reticulatus (Pers.) Ricken; Identified by: Darvin DeShaver ; Collected by: Bill Yule ; Voucher Specimens are located at the Botany Herbarium, Field Museum of Natural History, Chicago.

Proposed Names

20% (3)
Recognized by sight: I agree with Pulk – although many Bolbitius can show reticulate cap patterns as they dry out, B. reticulatus (synonymized by some with B. aleuriatus) should never show a red/orange/extensively yellowish cap.
31% (2)
Recognized by sight: a perfect match to the mushroom formerly called as such. Too many differences for me to believe that this is titubans/vitellinus. it is certainly not reticulatus tho. I had never seen this mushroom before, and reticulatus was suggested by Darv and i had no argument, at the time. Look up photos of variicolor, and you will see what i mean.
45% (2)
Eyes3
Recognized by sight: Current name for B. variicolor.

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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By: Christian (Christian Schwarz)
2014-12-16 20:11:36 EST (-0500)

“Notes: Voucher Number: NAMA 2012-255 ; Bolbitius reticulatus (Pers.) Ricken; Identified by: Darvin DeShaver ; Collected by: Bill Yule ; Voucher Specimens are located at the Botany Herbarium, Field Museum of Natural History, Chicago.”

I don’t know what their policy is about loaning to individuals. The Psathyrella uliginicola paratype I requested from UMich (as an individual) was rejected (they don’t loan to individuals), so I had to file it through UCSC – still waiting to hear back about that request.

I’m not really sure.
By: Byrain
2014-12-16 19:55:58 EST (-0500)

It would be worth finding out though, until then I personally prefer to go with more experienced opinions like that from Eef Arnolds who wrote the Bolbitius, Conocybe & Pholiotina sections of FAN6.

If this collection exists, any chance we can get a sequence and micro for it?

thanks Byrain, for the descriptions.
By: Debbie Viess (amanitarita)
2014-12-16 19:45:36 EST (-0500)

we simu-posted our last remarks!

Have these two forms been DNA matched? In other words, is it REALLY a form of titubans, or another species entirely?

Wasn’t the micro for P. cyanescens and P. allenii also identical? Just the macro and DNA were different.
Perhaps the same is true here?

I am having a hard time making this into the very familiar and not at all like this titubans, “variety” or no.

Nothing.
By: Byrain
2014-12-16 19:37:54 EST (-0500)

I was agreeing with the suggestion, just I prefer the current name per index fungorum and FAN6. I reduced my vote to “Doubtful”.

“1b. var. olivaceus (Gillet) Arnolds in Persoonia 18: 204. 2003. – Fig.
128B.
Bolbitius vitellinus var. olivaceus Gillet in Rea, Brit. Basidiomyc.:
497. 1922. – Bolbitius variicolor Atk., Studies Amer. Fungi: 164. 1900”

“Bolbitius titubans var. olivaceus is often regarded as a separate
species with the correct name B. variicolor. However, the epithet
olivaceus has priority at the rank of variety (see Arnolds in Persoonia
18: 204–205. 2003).
The microscopic characters of var. olivaceus are identical with those
of var. titubans. The pileus surface is frequently rugulose to reticulate
at centre, but this is also occasionally the case in large basidiocarps of
var. titubans. It is also said that var. olivaceus differs in the (sub)fas-
ciculate growth, but this character obviously depends on the substrate.
Both var. olivaceus and var. titubans may occur in fascicles on large,
homogeneous substrates, such as soil mixed with dung and on wood-
chips. On excrements var. olivaceus grows solitary, like var. titubans.
The only remaining difference is the duller, more or less olivaceous
colour in var. olivaceus.”

KEY TO THE VARIETIES
1. Pileus entirely bright lemon-yellow to egg-yellow at first, becoming
beige to brown in broad marginal zone when maturing, retaining
bright yellow colour at centre; surface usually smooth, occasionally
rugulose to reticulate with yellow veins, concolorous with back-
ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1a. var. titubans
1. Pileus ochre-yellow, olivaceous yellow to olive-brown at first,
becoming brownish in broad marginal zone on maturing, retaining
yellowish or greenish colour at centre; surface often rugulose to
reticulate with veins darker than background, occasionally smooth
1b. var. olivaceus”

what makes this match “unlikely” Byrain?
By: Debbie Viess (amanitarita)
2014-12-16 19:31:52 EST (-0500)

it is an exact match for variicolor. the question is what are we calling it now. That is still a matter of debate.

area of collection also wrong.
By: Debbie Viess (amanitarita)
2014-12-16 19:28:29 EST (-0500)

these were collected by Bill at Woodside, CA prior to the foray, but brought in to the foray because they were interesting.

I thought that we didn’t voucher out of area mushrooms at NAMA?

This doesn’t look like B. reticulatus to me
By: Jacob Kalichman (Pulk)
2014-11-18 12:47:04 EST (-0500)

It looks like B. titubans.

See https://www.flickr.com/photos/pulk/5551319522.

Created: 2014-10-30 01:40:24 EDT (-0400)
Last modified: 2014-12-16 19:40:01 EST (-0500)
Viewed: 135 times, last viewed: 2016-11-28 19:40:19 EST (-0500)
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