SPECIES OF ALG^. 47 



26. SCHIZOGONIUM. 



One species; found on moist cliffs, Colorado . . murale, 139 



27 CONFERVA. 



§ In brackish water; diameter i2-i4yU fugacissima, var. saliria, 141 



§ In fresh water (A). 



A. Diameter of filament from 3-5 yU {a). 



A. " " " from 6-12/^ (^). 



A. " " " from i4-25ya [g). 



a. Very pale; cells 1^-2-3 times as long as wide . tenerrima, 143 



a. " " " 4-9 " " " " " . glacialioides, 143 



a. Green; cells 3-4 " " " " " . . rhypophila, 143 



b. Cells before division 7 times as long as wide . . . affinis 141 

 b. " " " 4-5 " " " " " (c). 



b. " " " less than 4 times as long as wide (if). 



c. Not constricted atthe joints ... ... fugacissima, 141 



c. Slightly " " " " (d). 



d. Cells before division about 4 times as long as wide . Funkii, 142 



d. " " " " 5 " " " " " filaments of ir- 

 regular thickness . . .... bumbycina, 142 



e. Cells more or less swollen {*) 



e. Cells not swollen, joints not constricted (/). 



* Diameter of filaments 10-12// . . ... vulgaris, 142 



* " " " 7-9y" .... . var. Farlowii, 142 

 /. Attached; chlorophyll evenly diffused . . abbreviata, 143 

 /. Not attached; contents granular . . . • . . punctalis, 142 

 g. Diameter of filaments 20-25// ... . amcena, 140 

 g. " " " less than 20/t (/;). 



h. Cells more or less swollen, about twice as long as wiAe.,floccosa, 140 

 h. " " " " constricted at the joints, 



utriculosa 140; fontinalis, 141 



28 CH^TOMORPHA. 



Marine, therefore omitted. 



29 RHIZOCLONIUM. 



§ On moist ground; cells 1.5-3 times as long as wide, 



hieroglyphicum, 1 44 

 § In brackish water (a). 

 § In sweet waters {I)). 



a. Filaments irregularly curved and angled. California, Casparyi, 145 

 a. Filaments not specially curved; diameter 20-30/t . . salinum, 145 

 "^ 33-40yM . . major, 146 



