six faint ridges ; the colored membrane of the oospore is perfectly 
smooth. No indications of mucus have been found on either of 
the forms in this variety. 
Gathered in Mizoro pond, Kyoto, Japan. 
E. —A NEW DIVISION OF THE FLABELLATAE-MACRODACTYLAE SPECIES OF THE 
DIARTHRODACTYLAE SECTION OF NITELLA. 
The species now known have been classified as (i) Subflabel- 
latae, leaves once or twice divided, and (2) Flabellatae, twice, 
thrice or even four times. While these divisions can not be 
sharply defined, they have served to embrace our known species 
and furnish places for many new ones ; but a few new forms have 
come to hand with leaves many times divided, with more than 
four or even six nodes, and it would be convenient to enlarge the 
bounds to admit them. They cannot be referred to the brachy- 
dactylae group, for they belong to the macrodactylae. They do 
not consort with the forms of N. pseudoflabellata A. Br., for the 
leaves differ in appearance, especially because the first segment 
of the leaf is not longer than half of the whole divided leaf; so I 
propose a new subdivision, Per flabellatae, with leaves p or more 
times divided. The new arrangement is as follows : 
1. Segments of the second division of the leaf, commonly 2 or j ; 
primary segments not longer than half of the divided leaf (N. mucro- 
nata A. Br., N. expansa Allen, etc.) § 1. Flabellatae. 
2. Secondary segments commonly p— 6 ; primary segments 
longer than half the divided leaf (N. pseudoflabellata A. Br. and 
varieties). § 2. Pseudoflabellatae. 
3. Secondary segments commonly 4.-5 primary segments not 
longer than half the leaf. Leaf many times divided with p —6 or 
more nodes. § 3. Perflabellatae. 
Since the forms of the last section are somewhat similar in 
habit, have a similar oospore-membrane, and the first node is 
usually sterile and the oogonia isolated, I have placed them under 
one species, with three varieties as follows : 
Nitella multipartita sp. nov. 
Plants elongated, 40 cm. or more, flexible, branching from 
nearly every verticil. Verticils somewhat remote (at centre of 
