Observation 108067: Geastrum rufescens Pers.

When: 2012-09-02

Collection location: Voskresensky District, Moscow Oblast, Russia [Click for map]

Who: Dmitriy Bochkov (convallaria)

No specimen available


Proposed Names

1% (3)
Recognized by sight
55% (2)
Recognized by sight: sorry, no microscopic data; not probable to correctly choose the sp. without it
56% (4)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
That’s right
By: Irene Andersson (irenea)
2012-09-03 20:23:11 CST (+0800)

G. rufescens is relatively large, often around 10 cm between the tips of the rays (the rays lying flat on the ground is typical)

G. fimbriatum is smaller, 3-6 cm, and the rays are usually getting inrolled below

G. saccatum is even smaller, 2-5 cm, reminds of fimbriatum, but has a distinctly delimited peristome

If you always have to rely on micro characters to identify a Geastrum, you are in trouble (that’s my five cents..).

oh, so that’s the case
By: Dmitriy Bochkov (convallaria)
2012-09-03 19:41:36 CST (+0800)

why they were very different in size (the ones in the first patch were a lot larger than in the second). I thought it was just due to some weather factors. I’m removing the last photo from here.

More than one species here
By: Irene Andersson (irenea)
2012-09-03 14:59:04 CST (+0800)

The first three pictures show Geastrum rufescens (no doubt..).

The last one is not the same, possibly Geastrum fimbriatum.

G. rufescens
By: Steph Jarvis (Steph Jarvis)
2012-09-03 04:05:55 CST (+0800)

The one thing that g. rufescens has, that G. saccatum does not, are hyphal protusions on the endoperidial gleba. So, without microscopy, you really cannot guess at this fungi.
G. rufescens may develop a pseudoparenchyma collar, or not. It may have an apophysis, or not. It is exactly in between G. saccatum and G. fimbratum.
So, you need to look at the tissue on the gleba’s endoperidial walls.

By: Steph Jarvis (Steph Jarvis)
2012-09-03 02:27:38 CST (+0800)

Do you have any microscopy notes on this fungi?