SPECIES OF ALGjE. 



57 



subsalsa, 212 



varians, 212 



quinina, 213. 



condensata, 215 



k. Membrane of spore smooth (/). 



k. " " " punctate {s). 



I. Cells less than twice as long as wide [m). 



I. Cells twice or more " " " " («). 



■m. Diameter 22-25/t; i-ij4 times as long as wide, 



m. " 25-33/*; i-2y2 " " " " " 



m. " 33-40//; 1-2 rarely 6 " " " " 



m. " 48-75/4; i-ij^ times " " " 



n. Diameter 33/* or more (o). 



n. " less than 33/* (^). 



(7. Diameter 33-40/i; 1-2 rarely 6 times as long as wide, quinina, '213 



o. " 30-5S/" (/)• 



/. Cells 3-7 times longer than wide; spiral dentate . Lutetiana, 214 



p. " 2-4 " " " " fusco-atra, 215 



q. Cells 3-5 times as long as wide (f). 



q. Cells 2-12 times as long as wide {gg). 



r. Diameter 22 /i or less . flavescens, gracilis, 211; communis, 213 



r. " 24/i or more . . varians, 212; Jurgensii, 213 



^. Diameter of cells 24-27/i, 6-12 times longer than wide, /a;zrf«^a, 215 



t. Spirals 2 («). 



/. " 3 (x). 



/. " 4 {aa). 



t. " 5 (^^). 



t. " 6 or more (ff). 



u. Diameter of cells 40/* or less (v). 



u. " " " more than 40/t (w). 



w. Cells 2-4 times as long as wide decimina, 216 



V. " 4-14 " " " " " . elongata, 221 



w. Cells 1-2 times as long as wide subcequa, 217 



a/. " 1.5-2.5 " " " " " . . . dubia, 220 



X. Cells 90-100/1 in diameter, joints somewhat constricted, 



jugalis, 219 

 X. Cells 50/1 or less in diameter (jc). 

 X Cells more than 50/* in diameter (z). 

 y. Cells 7-1 1 times as long as wide 

 y. " less than 7 times as long as wide 



z. Cells 1-2 times as long as wide 

 _g u 2 — -3 " '' " " " 



«. " 2-5 " " " " " 

 z. " 2.5-10 " " " " " 



. rivularis, 220^ 



dubia, adnata, 217 



. . subcequa, 217 



orthospira, 21S 



neglecta, 226 



:/(«, 221 



S 



