NEW SPECIES OF GREEN ALGAE 
150 ju latis, diametro 1-3-plo longioribus; chromatophoris 3-8, anfrac- 
tibus /^-4; zygosporis ellipticis plus minus acuminatis, fuscescentibus, 
100-140 iJL latis, 160-255 iJL longis. 
Filaments dark green, lubricous; vegetative cells 125-150 11 X 125- 
500 chromatophores 3-8, making ^-4 turns in a cell; zygospores 
elliptical with more or less pointed ends, brownish yellow at maturity, 
IOQ-I4O fJL X 160-255 fJL. 
The vegetative filaments of this form are quite indistinguishable 
from those of S. crassa Kuetz. which also occurs in this vicinity. 
The form and dimensions of the spores however are amply distinct. 
Known from the pond at the western edge of Casey, and from Hodgen's 
pond, Charleston, Illinois. Fruits during the summer and early 
autumn. Type in herb. E. N. T. Collections No. 1485, 1406, 1403, 
7#6, 769, 1352. Plate XXVII, figure i. 
Spirogyra ellipsospora var. crassoidea nov. var. 
Cellulis vegetativis 140-150 latis, diametro 1-4-plo longioribus; 
zygosporis late ellipticis et secundum positionem apice attenuatis, 
120-140 fx latis, 145-255 At longis; ceterum ut in typo. 
Vegetative cells 140-150 /x X 140-560 ijl, zygospores compressed 
elliptical, ends broadly rounded in one position, sharply pointed in 
another, 120-140 /x X 145-255 /x; otherwise as in the type. 
This variety has been recorded only from the Tile Factory ponds, 
Charleston. The form of the spore distinguishes it from the type, 
and the fact that the spores are compressed elliptical instead of com- 
pressed ovate separates it from S. crassa Kuetz. Type in herb. 
E. N. T. Collection No. 1507. Plate XXVII, figure 2. 
Spirogyra submaxima nov. sp. 
Filamentis plerumque caespites saturate virides lubricos efticien- 
tibus, rarius sparsis; cellulis vegetativis 70-1 10 )u latis, diametro 
1^-4-plo longioribus; chromatophoris 8-9, anfractibus .1-1; cel- 
lulis fructiferis tum modice tumidis tum cylindraceis ; zygosporis 
lentiformibus, maturitate bruneis, crass. 50-75 ijl, diam. 70-100 fx, 
mesosporio levi. 
Filaments usually forming dark green lubricous masses, more 
rarely scattered ; vegetative cells 70-1 10 /x in diameter, 100-300 ijl long; 
chromatophores 8-9, making i/io to i turn in a cell; fertile cells 
slightly inflated or cylindrical; sterile cells not enlarged; zygospores 
lenticular, brown, 50-75 /x in thickness, 70-110^1 in diameter; median 
spore wall smooth. 
This species has commonly a very thick pectose sheath, occasionally 
as thick as 17/x. It is distinguished from S. maxima (Hass.) Wittr. by 
