SPECIES OF ALG.E. 45 



d. Stratum tawny red, drying greenish; diameter of filaments 9-14^, 



odoratus^ 122 

 d. Stratum orange-red, drying yellow; diameter of filaments 7-9^, 



lichenicolus, 122 



d. Stratum red or orange, soft, silky; much branched; diameter of 

 cells 10-12/4 aureus, 121 



23. CLADOPHORA. 



Chlorophyll diffused, not in spirals (a). 



" disposed to be net-like or in lax spirals (d). 



a. Cell membrane smooth (&). 



a. " " plicate-striate; contents of young slightly spiral, 



crispata, 126 



b. Cells more or less swollen; irregularly branched; variable, 



fracta, 124 



b. Cells not noticeably swollen (c). 



c. Diameter of branches 28-40/1 oligoclona, 126 



c, " " " about i$jj. Flotowiana, 126 



d. Branches united (connate) at base; cells 5-8 times as long as broad, 



canilicularis, 117 



d. Branches not connate at base (e). 



e. Filaments not radiating from common centre, cells smooth (/). 



e. " " " cell membrane plicate . flavescens, 128 



e. " radiating from a common centre, much branched, 



cegagropila, 124 



f. Diameter of stems 6o-ioo/< glomerata, 127 



/. " " " 120-135^ fluitans, 128 



24. PITHOPHORA. 



A. Fertile stem 65^ thick (Edogonia, 130 



A. " " 175^ thick cequalis, 131 



A. " " 59/^ thick Kewensis, 131 



24a. SCHIZOMERIS. 



One species Leibleinii, PI. CXXV. 



25. ULOTHRIX. 



Length of cells equal to width (a). 

 " " " greater than width (e). 

 " " " less than width (h). 

 a. Color dark, light or bright green (b). 

 a. Color yellowish green (d). 



