60 SPECIES OF ALG^E. 



v. " ' 5 (). 



7-. " 6 or more (_#). 



w. Spore-bearing cells inflated, spore elliptic or ovate, elongata, 221 



w. " " " not or only slightly swollen (x). 



x. Filaments 32 -4<D/( in diam decimina, 216 



x. " 43-50^ " " dubia, 217 



x. " 55-6o/ " " subczqua, 220 



y. Mature spores yellow, oval, Y-Z longer than wide . neglecta, 216 

 y. " " not yellow (z). 



z. Diameter of filaments 90-iQo//; spore oval . . . jugalis, 219 

 z. " " 4o-65/< (aa). 



z. " 32-36/1 (<#) 



#0. Spore orbicular, flattened orthospira 218 



#0. Spore not flattened (). 



^. Spore spherical or broadly ovate siibaqiia, 217 



/^. Spore not elliptical or ovate (cc). 



cc. Spore oval-elliptical or subcylindrical . . . dubia, adnata, 220 



cc. Spore oval or subglobose, spore cells 2-4 times longer than wide, 



majuscula, 221 

 dd. Sterile cells 7-11, fertile cells about 4, times as long as wide, 



rivularis, 220 

 ee. Spore-bearing cells much inflated, spore oval, 8o/< long, 



fluriatilis, 216 

 ee. " " " slightly or not inflated (ff). 



ff. Spore flattend, orbicular orthospira, 218 



ff. Spore not flattened (gg). 



gg. Diameter of filaments 150-156^ crassa, 219 



gg. " io2-no/f setiformis, 219 



gg. " " " 90-1 oof* ...'.... jugalis, 219 



gg. " " " 7 2- 7 8yu(/^). 



^. Chlorophyll bands making 1-4 turns in each cell . nitida, 217 

 M. " " ' i y^ " spore 50/1 wide, 



parvispora, 221 



ii. Spores flattened, orbicular, membrane smooth . . orthospira, 218 

 ii. Spores " " " punctate or porose, 



bellis, 217 



jj. Filaments of two widths, one 125^, the other 8o//, inaqualis, 218 

 jj. " of equal width (kk). 



kk. Diameter 150-156^ crassa, 219 



kk. 1 18-125 JLI maxima, 218 



kk. " 102-no/f setiformis, 219 



kk. " 54-62/1 majuscula, 221 



