( 8 ) 
3-celled and very rarely subdivided ; the ultimate cell is a mucro 
i 5 at base by ioo long ; the oogonia are single at the node of the 
leaf, tapered; the oospore is 285 long by 272 broad, with five, 
rarely six, prominent, sharp ridges ; the membrane of the spore 
is covered by papillae, not pointed, about 1 p- long and about three 
in 5 (J. ; the antheridia are about 160 in diam., varying with age. 
Collected in Shakuhachi pond, Kyoto, Japan. 
Nitella Tanakiana sp. nov. 
Plant 20—25 cm. long, rather simple, sparingly branched ; ver¬ 
ticils of two sorts quite distinct, lower sterile, remote, consisting 
of six leaves divided near the end into 2 or 4 shorter terminals, 6 
or 7 mm. long, which are often again subdivided ; the terminals 
are, as a rule, 3 -celled, the ultimate cell a mucro ; the upper fertile 
leaves are very short, and at the upper part of the stem the ver¬ 
ticils become gradually smaller and closer or elongated shoots 
arise from the lower sterile verticils and bear only close whorls 
of fertile leaves (having the appearance of spikes) ; the fertile 
leaves are 2-divided (very rarely, a third division has been seen) ; 
the first node consists of 3 or 4 divisions, the second of 2 or 3 
(rarely 4) unequal terminals ; the terminals are 3-celled (with only 
an occasional exception) the first cell two-thirds the length of the 
entire terminal, the second cell tapering somewhat to the third 
which is a mucro ; the stem is about 333 /x in diam. ; the first seg¬ 
ment of a leaf 130, the second 116 to 58, the third 75 tapering 
to 50, the mucro, almost triangular, 30 to 45 at base and 80 to 
116 long ; the mucro drops easily and early ; mature leaves are 
rarely found with mucrones. 
The species is monoecious; oogonia occur on both nodes of 
the leaf, often aggregated. The oospore is 306 long by 272 
broad, with 6 (or 7) sharp and prominent ridges. The membrane 
is characterized by granulo-reticulate markings, small pointed 
granules are arranged in reticulated series with a faint connecting 
line, and with larger granules at the junction of the irregularly 
hexagonal reticulae. 
The relationship of this interesting species seems clearly to 
be in the group with N. rigida Allen, from which it differs by its 
more flexible habit, the character of the terminals and of the 
oospores. 
This plant was collected in Hirosawa pond, Kyoto, Japan. 
Nitella Saitoiana sp. nov. 
Plants 15—20 cm. long, somewhat branched, with numerous 
whorls of long leaves which become crowded and abbreviated 
