Observation 73806: Conocybe romagnesii Hauskn. & G. Moreno

When: 2011-07-29

Collection location: Davis, California, USA [Click for map]

Who: Byrain

Specimen available

Growing scattered across a large grassy field. They were very white, the caps were viscid, and they showed signs of deliquescing like the similar though I would think different Bolbitius in observation 70959. I managed to get a rusty brown print from one before it deliquesced.

Edit (3-20-12):

Spores smooth without a germ pore, non-amyloid.
Spore range = 11 – 13 (14) x (8) 9 – 10 μ
Average Spore = 12.07 × 9.2 μ
Average Q = 1.31
15 spores measured

One 4-spored basidia was found, it measured 23×13.5 μ. No cystidia on the gills were observed.


Mounted in KOH
Mounted in KOH
1μ divisions
Mounted in KOH
1μ divisions
Some kind of caulocystidia?
Mounted in melzers
1μ divisions
Dried specimen.
Spore print?
The specimen that left that also melted (Deliquesced? Like a Gastrocybe would) so perhaps this is just a remnant of that?

Proposed Names

13% (2)
Recognized by sight
30% (2)
Recognized by sight: Reminds me of a white (maybe sterile?) C. apala.
28% (1)
Recognized by sight
Based on microscopic features
25% (3)
Recognized by sight
82% (4)
Eye3 Eyes3
Recognized by sight
Used references: http://bit.ly/104ke9s
Based on microscopic features

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
That looks close
By: Byrain
2012-08-14 12:16:36 PDT (-0700)

And I think I may have even seen something like that (But really tiny and my camera died before I could take pictures…), but the texture of the stipe & cap as well as the expanding cap seem different. This species I have seen in 4 separate locations (2 were single specimens I didn’t collect) and the cap never seems to expand, instead they just collapse and disappear after it gets hot.

Reminds me of observation 23
By: Alan Rockefeller (Alan Rockefeller)
2012-08-14 10:24:21 PDT (-0700)
Nope, white spored…
By: Byrain
2012-08-12 15:36:06 PDT (-0700)

I found this again yesterday, this time I let some mature a bit in the fridge before scoping, the gills never changed colors and I found many of these hyaline spores with a 1 µm thick walls, the wall at the apex is narrowed or they have an obscured & very hard to see germ pore. Overall they were bigger and more mature looking then this observation. I have no idea what to call it yet…

Conocybe apala & Gastrocybe lateritia/C. deliquescens intermediate forms
By: Byrain
2012-08-08 01:15:36 PDT (-0700)


“Interestingly, intermediate forms exist between C. lactea and G. lateritia, in which the cap is white (like C. lactea) but collapsed and with deliquescent gills (like G. lateritia), or brown and viscid (like G. lateritia) but open (like C. lactea).”

I think the spores in this collection are immature after seeing many similar spores alongside normal mature spores recently, so perhaps this is something like the first intermediate form mentioned?

Edit: If this is Bolbitius, its not included in Flora Agaricina Neerlandica Vol 6 or this Roland Labbé, mars 2010. Bolbitius key I have, neither includes an all white species.

Not Bolbitius?
By: Byrain
2012-03-20 22:20:52 PDT (-0700)

The spores are hyaline without a germ pore, the gills are distinctly yellowish/rusty dried and the bulbous base is really pronounced. I’m not seeing any cystidia yet and micro pics will come soon.

By: Danny Newman (myxomop)
2011-08-12 00:03:05 PDT (-0700)

are you able to post any micro-photos? a look at the spores could be helpful.

Not sterile
By: Byrain
2011-08-11 23:52:14 PDT (-0700)

I was able to obtain a spore print from one before it turned into a bubble and popped into a gooey mess. And I’m pretty sure its not Conoccybe apala, that species was fruiting abundantly in the same field and has a typically non-viscid cap + is a bit more fragile. The C. apala observation 73804 (http://mushroomobserver.org/73804?q=66IL) was from the same day and an adjacent field except for the last photo I just added which has specimens from this field.

Created: 2011-08-11 17:20:09 PDT (-0700)
Last modified: 2016-06-24 15:21:08 PDT (-0700)
Viewed: 367 times, last viewed: 2018-02-17 00:17:46 PST (-0800)
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