C. —DESCRIPTION OF A NEW JAPANESE NITELLA ALLIED TO OUR AMERICAN SPECIES, 
N, TRANSILIS ALLEN, AND N. TENUISSIMA DESV. 
Nitella gracillima sp. nov. 
Plants very delicate ; 6 to 8 cm. high; branched, but not dif¬ 
fusely ; branches and leaves mostly rather erect, not spreading ; 
stem 80 to 90 <1 diam. ; verticils consist of 6 leaves ; leaves some¬ 
what erect, not diverging from the stem, not quite equal to the 
internode (aspect of N. transilis Allen) ; leaf usually thrice di¬ 
vided ; the first segment nearly half the length of the entire leaf; 
54—60 in diam.; first node has 6-7 divisions ; sterile; the second 
segment, shorter, 40 to 48 in diam.; the second node bears four di¬ 
visions, fertile; the third segment, 30 to 35 in diam.; the third 
node, fertile, bears 4 or even 5 terminals; the terminals slender, 
longer than the preceding segment and nearly as long as the 
first, 34 in diameter, one-celled, except the mucro, which is about 
15 in diameter by 55 to 68 long (large for the size of the plant), 
The oogonia are isolated at the second and third nodes of the 
leaf; the oospore is 190 to 197 long by 1 50 to I 56 broad, with six 
or seven sharp wavy ridges. Antheridium 125 to 135 in diam. 
The spore membrane is remarkable in being covered with coarse ele¬ 
vated elongated granules. The ridges are acute at their tops, but 
spread at their bases, where they join the surface of the shell; these 
bases are wavy-toothed. The granules are often very short, al¬ 
most oval, often elongated even to a length of five mikrons. 
This species approaches N. transilis Allen, differing in its 
greater tenuity, much smaller oospore, with a different spore mem¬ 
brane. 
Collected in “ Shinbashi water” province of Mikawa, Japan 
mature in December. 
D, -DESCRIPTION OF NEW VARIETIES AND FORMS OF NITELLA PSEUDOFLABELLATA A. 
BR. FROM JAPANESE WATERS. 
The name was given by A. Braun to the species collected 
by the Prussian expedition to eastern Asia, 1866. This was 
formerly confused with N. flagelliformis (Ndispersa A. Br.) 
from Java, in Lake Telaga Padenga (in Herb Van den Bosch) very 
elongated, one to two feet, relatively slender, verticils remote with 
condensed and tangled leaf-tips, so differing from N. gracilis, also 
blackish-green, flexible. * * * Fertile leaves three- or even 
four times divided. The first segment of the leaf distinguished by 
its length, as long as, or longer than all the divided part of the leaf. 
