SPECIES OF ALG^E. 59 



g. Mature spores yellow or orange, 40-42/1 in dia. 2-3 times longer, 



calospora, 209 

 h. Spore-bearing cells not swollen, spores twice as long as wide, 



Hantzschii, 211 

 h. Spore-bearing cells swollen (/). 



/. Mature spore yellow, 42-487* long Hassallii, 210 



/. " " brown, elliptic, 28 7* in diameter . . . insignis, 210 



j. One chlorophyll band in each cell (>&). 

 j. Two or more " " " " " (v). 

 k. Membrane of spore smooth (/). 

 k. " " punctate (u). 



1. Mature spore yellow (m). 

 I. " " not yellow (/). 



m. Spore cell slightly swollen on one side, spore oval, twice as 



long as wide gracilis, 211 



m. Spore cell not swollen (n). 

 m. Spore cell swollen (o). 



n. Filaments 20-22/2 in diameter communis, 213 



n. 25-307* " " longata, 214 



o. Filaments 24-267* in diameter Jurgensii, 213 



o. " 40-437* " Lutetiana, 214 



/. Spore-bearing cell decidedly swollen (q). 



p. " " " not or slightly swollen (r). 



p. " " " swollen on one side only . . . varians, 212 



q. Filaments 24-277* in diameter mirabile, 211 



q. " 13-207* " " flavescens, 211 



r. Filaments more than 307* in diameter (s). 



r. " 307* or less in diameter (/). 



s. Diameter of filaments 33-407*; spores polymorphous, quinina, 213 



s. " " 40-557*; spores polymorphous, 



fusco-atra, 215 

 s. " " " 48-757*; spores broadly elliptic, 



condensata, 215 

 t. Diameter of filaments 25-307*; spore twice as long as wide, 



longata, 214 

 /. " " " 22-257*; spore slightly longer than wide, 



subsalsa, 212 



u. Mature spore yellow, spore cell much inflated, . . punctata, 215 

 v. Spirals 2 (w). 



v. 3 (y). 

 v. " 4 (ee). 



