CHAETOPHORA. 117 



Plate CIII, fig. 11, a thallus of larger size. 



The last three are very closely related ; scarcely separable ; 

 appear to be conditions of growth rather than species. 



CHAETOPHORA ENDIVIAEFOLIA, Ag. 



Thallus gelatinous, bright or dark green, often elongated 

 to 80 mm (3 inches), with margins tattered, forming ragged, 

 laciniate, dichotomose branches ; composed of a union of 

 many slender articulate branched filaments ; articulations 

 long, cylindrical, or somewhat swollen, mostly colorless; 

 fascicles of branchlets lateral, more or less dense, spreading ; 

 articulations nearly equal in length and diameter ; cell con- 

 tents granulose, effused. 



Diameter of articulations, 10-25 /*. 



A variable species, appearing in different stages of growth, 

 and under different conditions, as distinct forms which have 

 been arranged by Babenhorst as 



VARIETIES. 



a. linearis, Bab. Thallus linear, simple, elongate, bright 

 green. 



b. ramosissima, Bab. Thallus plane, 3 inches long, repeat- 

 edly pinnatifid. 



c. incrustans, Bab. Lobately sinuate, densely caespitosely 

 aggregated and in crusted. 



d. crassa, Ag. Sub-plane, short, thick, lacinula spinose. 



e. cornuta, Bab. Ch. cornu-damae, (Both.) Ag. Thallus some- 

 what terete, papillose, lobed. 



f. davata, Ag. Thallus terete, vaguely sinuate, club-shaped. 



g. crystallophordj Kg. Thallus variously sinuate, sub -terete, 

 obscure green, hard, incrusted. 



Syn. Batradiospermum fasciculatum, Vauch ; Ulva incrassata, 

 Eng. Bot. 5 Conferva gelatinosa-Damae-cornu, Bay Syn.; 

 Tremella gelatinosa-Dama-cormmm, Dillw. ; Myriodactylon 

 endiviaefolium. Gray. 



Plate CIV, fig. 1, var. cornuta or cornu-damae, twice the 

 natural size ; fig. 2, a simple lobe of the same largely mag- 

 nified ; fig. 3, var. linearis ; fig. 4, small section of var. line- 

 aris largely magnified ; fig. 5, small form of var. ramosissima, 

 natural size ; figs. 6, 7, larger form of var. ramosissima, natural 

 size ; figs. 8, 9, small section of the last, the tip of a lobulet, 

 much enlarged. 



Not rare in sluggish streams and small pools. Had speci- 

 mens from many States and Canada, 



