352 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



2, are not clear enough to justify his determinations ; No. 143, 

 Tilden, American Algae, does not show the characters of the 

 species. This 143 is given as C. canalicularis (Roth) Kg. var. 

 gcnuina Rabenh., 1868, p. 342 ; no such combination appears 

 on that page, or apparently elsewhere in the work. 



45. C. CALLICOMA Kiitzing, 1843, p. 267 ; 1854, PL 

 XXXVII, fig. i; Rabenhorst, Algen, No. 2166. Forming 

 rather dense, soft tufts, up to 30 cm. high ; filaments 75-125 /u, 

 diam. below, 35-50 p. in the ramuli ; cells cylindrical or slightly 

 inflated below, distinctly inflated in the ramuli, 6-8 diam. long 

 below, 2-4 in the ramuli ; branching subdichotonious below, then 

 alternate, and in the ramuli alternate or somewhat secund ; tips 

 rounded. Housatonic River, Conn. ; Long Brook, Princeton, 

 N. J. ; Montana. 



Forming soft tufts in streams ; usually quite dense, but the 

 tips penicillate rather than glomerate. An authentic specimen, 

 received by the kindness of Dr. Bornet, shows dimensions 

 larger than those usually given ; the specimens distributed 

 under this name as Nos. 25 and 919 P. B.-A., seem to be rather 

 C. Kuetzingiana Grunow. A plant from Watkins' Glen, N. Y., 

 agrees well with this species; Wolle records C.fluitans from 

 this locality, but the specimen just mentioned is evidently not 

 that species. 



46. C. KUETZINGIANA Grunow in Rabenhorst, 1868, p. 

 342 ; C. callicoma P. B.-A., Nos. 25, 919. Forming soft, rather 

 loose and feathery tufts up to 30 cm. high ; filaments 45-85 fi 

 diam. below, ramuli 25-35 /* diam. ; cells cylindrical or in the 

 ramuli slightly swollen; 6-10 diam. long below, occasionally 

 longer ; 2-4 diam. long in the ramuli ; branching erect, opposite 

 or alternate below, but the ramuli generally secund, rather long 

 and tapering, with acute or subacute tips. Still River, Conn. ; 

 Lake Washington, Seattle, Wash. 



A large but delicate species, with long, feathery tufts ; grow- 

 ing in lakes and rivers. It appears to be the C. macrogonya of 

 Kiitzing, but not of Rabenhorst, Algen, No. 2384, nor the 

 Conferva glomerata var. macrogonya of Lyngbye, 1819, PL LI II. 



The following forms seem to belong under C. Kuetzingiana, as 

 here understood : 



C. glomerata var. callicoma forma B or cali- Americana Brand in 

 Tilden, American Algae, No. 536. Primary filaments gener- 



