216 Transactions British Mycological Society. 
dishes, give rise to fruit-bodies some of which are perfect but © 
others of which produce many spores which never ripen, a few 
ripe spores only, or no spores at all. Since this imperfection in 
spore-production is common to fruit-bodies produced by mycelia 
of both monosporous and polysporous origin, it cannot be due 
to sex. 
10. Since Coprinus lagopus and C. miveus are both homo- 
thallic and yet produce oidia, Mlle Bensaude’s interpretation 
of oidia as sex-carriers seems to be of doubtful value. 
The investigations recorded above were made in the Botanical 
Department of the University of Manitoba during the tenure 
of a Studentship granted by the Canadian Honorary Advisory 
Council for Scientific and Industrial Research. In conclusion, 
I wish to express my indebtedness to Professor A. H. R. Buller 
for suggesting the investigation and for continuous help and 
encouragement during the progress of the work. 
DESCRIPTION OF THE ILLUSTRATIONS. 
PLATE: Viz 
The magnification for Figures 1 and 2 is 510, and that for the remaining 
figures 480. 
Fig. 1. Coprinus sterquilinus. A germinating spore after 17 hours in a potato 
decoction. 
Fig. 2. Coprinus sterquilinus. Another germinating spore after 21 hours in 
a potato decoction. 
Fig. 3. Coprinus sterquilinus. Two hyphae showing clamp-connections. From 
a compound mycelium of polysporous origin derived from the spores of 
a fruit-body of monosporous origin. 
Fig. 4. Coprinus sterquilinus. A branched hypha showing one perfect clamp- 
connection and another clamp-connection in course of formation. From 
a monosporous mycelium of the fifth successive generation. 
Fig. 5. Coprinus lagopus. A germinating spore after 18 hours in a dung- 
gelatine culture medium. 
Figs. 6 and 7. Coprinus lagopus. Hyphae showing clamp-connections. Both 
from a monosporous mycelium derived from the spore of a wild fruit-body. 
Fig. 8. Coprinus lagopus. A branched hypha showing a clamp-connection. 
From a compound mycelium of polysporous origin derived from the 
spores of a fruit-body of monosporous origin. 
Fig. 9. Coprinus stercorarius. A branched hypha showing two small clamp- 
connections. From a compound mycelium of polysporous origin derived 
from the spores of a fruit-body of monosporous origin. 
Fig. 10. Coprinus niveus. A germinating spore, taken from a fruit-body of 
monosporous origin, after 18 hours in dung-gelatine. 
Fig. 11. Coprinus niveus. A branched hypha showing two clamp-connections. 
From a compound mycelium of polysporous origin derived from the 
spores of a fruit-body of monosporous origin. 
Fig. 12. Coprinus ephemerus (a purplish form). A branched hypha showing 
two perfect clamp-connections and one clamp-connection in course of 
development. From a compound mycelium derived from the, spores of 
a wild fruit-body. ; 
Fig. 13. Coprinus curtus. A hypha showing three simple septa. From a 
monosporous mycelium derived from a spore of a wild fruit-body. The 
mycelium had been growing for 19 days. , 
