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, ' PI. 

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

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

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

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

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

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

 rounded. Housatonic River, Conn. ; L,ong 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. flu Hans 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 /* 

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

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

 longer; 2-4 cliam. 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. ; 

 L,ake Washington, Seattle, Wash. 



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

 ing in lakes and rivers. It appears to be the C. unicn^oin'a of 

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

 Conferva glomerata var. macrogoiiya of Lyngbye, 1819, PI. LIU. 



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

 here understood : - 



C. glo merata var. callicoma forma B or eali- Americana Brand in 

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



