74 
TENTH REPORT. 
(e) Threads of capillitium with scattered prickles; peridium very thick 
and leathery 4. Mycenastrum. 
(f) Peridium flaccid, opening by a definite mouth (g) 
(f) Peridium brittle, breaking into fragments from above downwards; 
with long branched capillitium threads 5. Calvatia. 
(g) Spores with distinct, permanent pedicels 6. Bovistella. 
(g) Spores not pedieillate; threads of the capillitium long and slender, 
simple or branched 7. Lycoperdon. 
1. Geaster. 
Key to species:* 
(a) Exoperidium recurved (b) 
(a) Exoperidium fornicate Geaster coronatus. 
(a) Exoperidium saccate Geaster saccatus. 
(b) Plant large, reddish-brown (c) 
(b) Plant small Geaster minimus. 
(c) Unexpanded plant globose; columella large, thick, globose. 
Geaster rufescens. 
(c) Unexpanded plant acute; columella elongated, prominent. 
Geaster triplex. 
(a) Geaster coronatus (Schaeff) Schroet. 
Other names: 
Geaster fornicatus (Huds.) Fr. 
This species is not yet reported for our flora. The reflexed exoperidium 
is arched over the mycelial layer which separates and remains as a cup in 
the ground, the recurved segments being supported on the raised margin 
of the cup. 
(b) Geaster saccatus Fr. 
Other names: 
Geaster fimbriatus Fr. 
Common in the woods about Ann Arbor, among decaying leaves. The 
outer peridium recurves but not so as to raise up the sessile globose inner 
part. 
(c) Geaster minimus Schw. 
Other names: 
Geaster marginatus Vitt. 
Reported by Longyear, 4th Report. 
(d) Geaster rufescens Fr 
Not yet reported, nor distinguished in the state, but said to be more com- 
mon than the next. Probably reported under G. triplex. 
(e) Geaster triplex Jung. 
Abundant throughout the state, either as this species or the preceding. 
Further observation is necessary to determine the distribution of these two 
hitherto confused species. See the key. 
2. Catastoma. 
(a) Catastoma circumscissum (B and C.) Morg. 
Other name: Bovista circumscissum B. and C. 
“ Spores globose, minutely warted, 4-5 mic, often with minute pedicel; the 
capillitium of short pieces of threads, flexuous, hyaline, 3-4 diam.” 
Reported by Longyear; in sandy fields. Morgan found it in barnyard 
and cattle lanes on heavy clay soil. 
* Adapted from Lloyd. 
