Public Description of Geastrum fimbriatum Fr.

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Name: Geastrum fimbriatum Fr.
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Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Geastrales
Family: Geastraceae

Diagnostic Description:

From Ponce. (1968) (public domain):

Unexpanded basidiocarp globose, submerged, becoming expanded when 3
cm. wide; 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; fleshy layer bay-brown,
continuous, adnate; outer layer tending to split away from the others,
wholly covered with debris held by the mycelial layer; base concave,
plane or convex; endoperidium sessile, 0.5-1 cm. diameter,
depressed-globose, dingy- white to umber brown, glabrous, smooth;
mouth indeterminate with fibrous or lacerate margin, sometimes
surrounded by a slightly depressed and lighter zone, sometimes
approaching the fibrillose condition; gleba umber; columella
inevident; spores globose, 3.4um, fuscous, finely verrucose;
capillitium threads unbranched, 5um thick, usually lighter than the
spores, tapering, undulate.

This species lives in the soil; in rich humus, much debris remains
attached to the outer layer. The tendency of the outer layer to sep-
arate from the exoperidium sometimes leads to confusion of this spe-
cies with G. saccatum and G. javanicum. G. fimbriatum is hypogeous,
always has some adherent debris, and lacks the prominent umbilical
scar at the base of the exoperidium.




In small groups on humus under cedar or in mixed woods.

Look Alikes:

It is very difficult to separate this species from the small forms of
G. saccatum, from which it differs externally only by the lack of a
ring around the mouth area. The spores are smaller than those of
G. saccatum and the spines are shorter and thinner.


Ponce de Leon, Patricio, A Revision of the Family Geastraceae, Field Museum of Natural History 1968.
Geastrum fimbriatum (Fr.) A. H. Smith, Puffballs and their Allies in Michigan, 92. 1951.
G. rufescens var. minor Pers. Syn. Meth. Fung. 134. 1801.
Geaster fimbriatus Fr. Syst. Myc. 3: 16. 1829.
G. tunicatus Vitt. Monogr. Lye. 162. 1841.
G. djakonense Schul. Kuj. Rada. Jugosl. Akad. Zwan. Mat. Period. Vazzeda 64: 6. 1882.
G. infrecuens Lloyd, Myc. Writ. 2: 263. 1906.

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Description editor: La Monte Henry Piggy Yarroll