22, THE’ ODD OGONDACEAE 
In Oedocladium 3 species are monoecious and 1 dioecious, 
nannandrous. In the large genus Oedogonium 61 species, 
15 varieties, and 8 forms are monoecious; 56 species, 25 varieties, 
and 11 forms are dioecious, macrandrous; and 77 species, 
36 varieties, and 19 forms are dioecious, nannandrous. Oe. 
varians and Oe. trioicum are known to be both monoecious and 
dioecious. The above summary does not take into account 
any members of the Oedogoniacez with incomplete descriptions. 
DISTRIBUTION AND PERIODICITY. 
Species of Bulbochaete and of Oedogonium are widely 
distributed in freshwater, the world over. Oedocladium is so 
far reported only from the eastern United States and from 
TABLE II. 
Distribution by continents of the total number of species, varieties, and forms 
(grouped together) of the genera of the Oedogoniaceae. 


Genus cee A Coe si Europe Asia Africa pene 
BullOChaete. =. 2.3. s - 38 15 49 aie Cae 3 14 
Oedocladium. eee 3 0 1 0 ie 0 0 
Oeitei) aie abbas | 77 | 199 49 rian eee 

Germany; three of the species are terrestrial, growing on wet 
mud, and the fourth is aquatic. Hirn (1900) reports Oe. 
capillare, Oe. oblongum, Oe. pluviale, and B. rhadinospora var. 
litoralis from brackish waters of Europe. In a vegetative state 
Oedogonium is known as a part of the red and yellow snow of 
the Orkneys (Fritsch 1912). Species of both Bulbochaete and 
Oedogonium have been collected at considerable elevations in 
alpine regions, usually however not in fruiting condition. 
Without distinguishing among species, varieties, and forms, 
the preceding table (Table II) shows the distribution of all 
members of the Oedogoniacee by continents. Purely as a 
matter of convenience, Australia is used to include not only 
that continent but also the nearby groups of islands of New 
Zealand, Melanesia, and Malaysia. 
Data from the North Central States of the United States 
(Tiffany and Transeau 1927) indicate that most species of 
