Observation 203470: Geastrum minimum Schwein.
When: 2015-04-26
No herbarium specimen

Notes: In duff under Arizona cypress at about 5000’. White parchment like spore sac with fibrillose mouth,a hint of a stem, firmly attached, largest about 15 mm. in dia. Brown inner layer has a leathery feel and is split into 8-9 rays.

Proposed Names

22% (2)
Recognized by sight
39% (3)
Eye3 Eyes3
Recognized by sight: These have been around for a while, so i wouldn’t expect to oxalate crystals and a well defined fibrillose mouth, but given the size, the accumulation of debris by the mycelial layer, and the short neck I’m fairly confident it is minimum.
0% (2)
Recognized by sight: Nice set of images for making an ID.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Terri Clements/Donna Fulton (pinonbistro)
2015-05-05 09:01:00 PDT (-0700)

I’m still having trouble seeing it. Here’s a partial description from the MO name page: “…exoperidium split to about the middle into 6-8 unequal,
flaccid, pointed rays, whose tips turn under when completely open, leaving the base shallowly saccate..” See obs 119028 for specimens in the same condition as mine. The rays of these and fresh specimens are quite clearly turned under.


By: John Steinke (John Steinke)
2015-05-05 05:25:56 PDT (-0700)

I am still stuck on G. fimbriatum. “Stalk absent or very short” is under the variations in Sunhede 1989. In the fresh state you would never see a stalk.
Take away the dispute over the stalk and everything else fits.


Hi John
By: Terri Clements/Donna Fulton (pinonbistro)
2015-05-01 08:18:43 PDT (-0700)

G. fimbriatum is sessile (without a stem). Here’s a description of the fruitbody from http://www.first-nature.com/fungi/geastrum-fimbriatum.php “5 to 9 creamy-white outer rays are recurved beneath the unstalked papery grey spore sac, which is finely downy.”


Got to wait
By: Terri Clements/Donna Fulton (pinonbistro)
2015-04-28 18:46:09 PDT (-0700)

until the black flies leave!

By: Martin Livezey (MLivezey)
2015-04-28 10:53:38 PDT (-0700)

I am expecting to see observations posted from Maine soon!:)

I have to admit
By: Bob Chapman (Disciseda)
2015-04-28 10:35:49 PDT (-0700)

that most of my exposure to the Geastrums has beem macroscopic. They do generally have sufficient visible characters (well OK sometimes). The keys I’ve used for Geastrum make use of macroscopic characters almost exclusively. They certainly don’t have the variety of spore ornamentation found among the Tulostomas.

Minimum is probably the Geastrum I find in NM most often, but it is variable, and I don’t always recognize it immediately, especially when not in pristine condition.

These are some I’ve found and am calling minimum:


Thanks Bob
By: Terri Clements/Donna Fulton (pinonbistro)
2015-04-27 16:02:29 PDT (-0700)

for the proposal. This is the first one of these I’ve found so I wasn’t quite sure of the terms in the key at Mycoportal. There doesn’t seem to be much info online. Just out of curiosity, and in case I get a scope one of these days, are the spores in Geastrum as helpful in the ID as they are in Tulostoma?

Thanks again,


Created: 2015-04-26 15:58:18 PDT (-0700)
Last modified: 2015-05-01 17:58:03 PDT (-0700)
Viewed: 159 times, last viewed: 2017-06-20 00:04:39 PDT (-0700)
Show Log