﻿Allen: Contributions to Japanese Characeae 81 



The following forms coincide with the type in having leaves 

 with 4 to 6 nodes ; the first node always sterile ; the oogonia iso- 

 lated at the second and third nodes and the spore-membrane 

 granular. 



As regards division of the leaf, the type has six nodes : f. 

 sub erect a and f. intermedia have each five and f. transiliforma 

 four. In respect to size the type is more spreading and longer, 

 f. intermedia is coarser and /. transiliforma the most delicate ; as 

 to oospores fi. intermedia reaches 306 fi long by 218 broad, while 

 the others vary within the limits of 240 to 300 long by 224 to 290 

 broad ; the granulation of the spore-membrane is tolerably uni- 

 form in all, but faintest inf. suberecta. 



The mucrones vary from 48 by 15 intermedial 61 by 27 in 

 suberecta, 54 by 30 in the type and fi transiliforma. 



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Nitella multipartita Allen, forma suberecta. 



Plants 15-20 cm. long, rather erect, sparingly branched ; stem 

 about 400-500 in diam. Verticils spreading, color dull yellowish 

 green, more of the aspect of the forms of N. pseudofiabellata than 

 of the bright, clear green of the succeeding form. Leaves bear, 



fi 



fi 



sions, sterile ; fifth node with 2 or 3 divisions. The segments 

 of the leaves vary, the first 2800-3300 long, 122 in diam., the 

 second 1600-2600 long, 48-80 in diam.; the third 1400-2700 long, 

 54 in diam.; the fourth 500-2000 long, 40 in diam.; the terminals 

 170-240 long, 34 in diam.; the mucro 20-25 in diam. at base by 

 50-68 long. The oogonia are isolated ; the oospore 272 long by 

 245 broad, with seven faint striae, faintly granular. 



Collected in Mizoro pond, Kyoto, Japan, in July. 



Nitella multipartita Allen, forma transiliforma. 



Plants about 20 cm. long, erect with about six verticils of bright 

 green leaves. Verticils do not overlap ; stem-nodes about 30-40 

 mm. distant, leaves about 2^ mm. long. Stem sparingly branched, 

 as a rule only near the base ; stem and branches erect. Leaves 

 slightly spreading, somewhat erect, forming a close verticil 

 about the stem. Stem 400-500 in diameter. Verticil consists 

 of 7 leaves. Leaves 3-4 divided ; first node 6-7 divisions, sec- 

 ond 3-4 divisions, third 2-3 divisions, fourth (when present) 2-3 

 divisions. The first segment, less than half the length of the leaf, 

 105 in diameter, the second 75, the third 50, the fourth terminal, 40 



