44 SPECIES OF ALG^E. 



k. Length 4-50 mm.; somewhat branched, branches simple, 



tenue, no 



k. " 2-3 mm.; branches alternate, ends obtuse, . nanum, 112 

 k. " 12 mm.; branches mostly opposite, ends acute, 



ama>num, 113 



l8. CH^ETOPHORA. 



Jelly mass globose or nearly so (a). 



Jelly mass elongated to 3 inches, margins tattered, forming ragged 



branches endivi&folia, 117 



Jelly mass orbicular, small; filaments hair-pointed . longipila, 118 

 a. Branches more or less moniliform; jelly mass 2 mm. diameter, 



monilifera, 1 1 8 



a. Branches not moniliform, radiating (b). 



b. Jelly mass smooth (c\ 



b. " " tuberculose, ends of branches rarely hair-like, 



tuberculosa, 116 



c. Diameter of branchlets 6/*; 1.5-3 times longer . pisiformis, 116 

 c. " " branches 7-10/1; 1-1.5 " "... elegans, 116 



19. MICROTHAMNION. 



But one species Kuetzingianum, 118 



20. APHANOCH^ETE. 



Parasitic (a). 



Not parasitic (b). 



a. Cells globose, a bristle on the back repens, 119 



a. Cells various, elongate, curved, worm-like, sub-globose, 



verm iculoides, 119 



b. Cells globose, or subpyritorm, a seta on the back or apex; in 



mucus globosa, 119 



21. GONGROSIRA. 



One species .^ Sclerococcus, 120 



20. CHROOLEPUS. 



a. Cells globose, broadly elliptic or ovate (b). 



a. Cells more or less elongate (<r). 



b. Dull or bright red; diameter 14-22^ .... umbrinum, 123 



b. Ash color when dry; diameter 20-25 .... moniliforme, 123 



c. Diameter of cells more than 25-40^; branches rather dichotomous, 



lolithus, 122 

 c. " " " less than 25^ (d). 



