44 SPECIES OF ALGJE. 



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



ienue, no 

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

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



amasnum, 113 



18. CHvETOPHORA. 



§ Jelly mass globose or nearly so (a). 



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

 , branches . . .... . . . endivicefolia, 117 



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

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



monilifera, 118 



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//; 1-1.5 " "... elegans, 116 



19. MICROTHASJNION. 



But one species . . . .?■ . . . Kuetzingianum, 118 



20. APHANOqjjI^TE. 



§ Parasitic (a). 



§ Not parasitic {b). 



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



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



vermiculoides, 119 



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



mucus . . . globosa, 119 



21. GONGROSIRA. 



One species . . . Sclerococcics, 120 



20. CHROOLEPUS. 



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



a. Cells more or less elongate (c). 



b. Dull or bright red; diameter 14-2 2/^ . . . umbrinum, 123 



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



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



lolithus, 122 

 c. " " " less than 2S/i ((/). 



