THE GREEN ALGAE OF NORTH AMERICA 351 



pears also to be merely a fruiting state of some L 'ladophora ; the 

 specimen distributed under this name in Tilden, American 

 Algae, No. 34, was sterile in the copy examined, and charac- 

 terless. 



Forma RIVULARIS Rabenhorst, 1868, p. 341 ; P. B.-A., No. 

 473 ; Tilden, Amer. Algae, No. 33. Frond elongate, more 

 open, fascicles of ramuli rather distant. Housatonic River, 

 Conn. ; San L,eandro, Cal. 



Forma MUCOSA Kiit/ing, 1849, p. 406; Tilden, Amer. Algae, 

 No. 537. Soft and mucilaginous ; color deep green. Niagara 

 Falls, Lake Ontario, Charlotte, N. Y. ; Minn. 



43. C. DECUNATA Kiitzing, 1849, p. 406 ; 1854, PI. XXXV. 

 Fronds usually loosely branched, with lateral and terminal 

 glomerules of recurved ramuli ; cells of main branches cylin- 

 drical, 80-100 p. diam., 3-10 diam. long; of ramuli 50-60 p. 

 diam., swollen and often variously distorted. California. 



Europe. 



In habit somewhat resembling the marine C. refrada. The 

 California!! specimens have long, subsimple branches with quite 

 long cells, and set at intervals with tufts of curved and more or 

 less distorted ramuli. C. glomcrata var. parvula Bailey in Rab- 

 enhorst, Algen, No. 520; Wolle, 1887, p. 128, is made a form 

 of this species by Rabenhorst, 1868, p. 340. A specimen dis- 

 tributed under this name in Tilden, American Algae, No. 37, 

 hardly shows the characters of this species. No. 38 of the 

 same distribution, C. declinata \&r.fluitans (Kg.) Hansg., 1886, 

 p. 84, does not have the characters indicated by Hansgirg. 



44. C. CANAUCUI.ARIS (Roth) Kut/.ing, 1845, p. 214; 1854, 

 PI. XLIII, fig. i ; Wolle, 1887, p. 126. Fronds 5-10 cm. high, 

 much branched, branching mostly di- trichotomous, branches 

 connate at the base ; ramuli often fasciculate ; main filaments 

 85-120 p. diam., cells 5-8 diam. long; cells in branches shorter, 

 in ramuli 1-1% diam. long, 35-50/1. diam., somewhat swollen ; 

 cell membrane usually thick. 



While no definite localities can be given, it is probable that 

 this species occurs with us ; it seems to be little more than a 

 rather coarse C. glomcrata. The occurrence of connate 

 branches is not uncommon in various species of Cladophora, 

 both fresh water and marine, and the length of the cells is a 

 very uncertain character. Wolle's figures, Pi. CXI, figs, i and 



