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



25, PI. XXXVI ; P. B.-A., No. 1078. Stolon creeping, naked; 

 fronds ascending, numerous, branching alternate, dichotomous, 

 or opposite ; ramuli fastigiate, issuing at rounded angles, cylin- 

 drical, long, obtuse, sometimes shorter and slightly clavate. 

 Fla., W. I. Brazil. 



A Vaucheria-like plant growing in tufts or turfs at low water 

 mark. It would hardly be taken for a Caulerpa by one familiar 

 with only the more elaborate forms. 



Var. CONPKRVOIDES Crouan in Maze and Schramrn, 1870-77, 

 p. 83. Stolon floating, emitting loose, floating fronds, 10 cm. 

 long. Fla., W. I. 



Differs from the type only in habit. P. B.-A., No. 1078 seems 

 to belong to this variety rather than to the type. 



2. C. PUSILLA (Kiitz.) J. G. Agardh, 1872, p. 6; Weber, 

 1898, p. 266, PI. XX, fig. 6 ; Vickers, 1908, p. 25, PI. XXXVIII. 

 Stolon covered with bifid, hyaline hairs, which attach them- 

 selves to the substratum ; fronds erect, up to i cm. high, at the 

 base surrounded by hyaline hairs, once or twice forked, and 

 bearing near the top two or three successive tufts of whorled, di- 

 or trichotomous, fastigiate, mucronate ramuli. Barbados. 



So. America. 



3. C. VERTICILLATA J. G. Agardh, 1848, p. 6; Weber, 

 1898, p. 267, PI. XX, figs. 7-10 ; P. B.-A., No. 665. Stolon 

 creeping, with few hairs ; frond repeatedly branched, up to 3-4 

 cm. high, filiform, bearing at the summit successive series of 

 two or more whorls of ramuli, two to many ramuli in a whorl; 

 ramuli fastigiate or, nearly so, sometimes spread out in fan- 

 shape, di- or trichotomous. W. I. Indian and Pacific Oceans. 



Resembling C. pusilla, but a larger plant, and with few or 

 none of the hairs characteristic of the latter. 



Forma CHAROIDES (Harv.) Weber, 1898, p. 267 ; Borgesen, 

 1907, p. 356, fig. 2. Frond bearing at' the summit alternate or 

 opposite, scattered ramuli, not arranged in series of whorls. 

 Cuba, St. Croix. Pacific. 



4. C. WEBBIANA Montagne, 1840, p. 129; Weber, 1898, p. 

 269, PI. XXI, figs. 1-4; P. B.-A., No. 1333. Stolon creeping, 

 covered with branching, hyaline filaments, which adhere to the 

 substratum. Frond ascending, a few cm. high, then recurved 

 and creeping, irregularly branched and surrounded by whorled 

 and imbricated ramuli, usually 4 in a whorl, but varying from 

 2-6 ; ramuli cylindrical at the base, repeatedly dichotomous, tips 

 forked or mucronate. Literal to 50 m. depth. W. I. 



Canaries, Mediterranean, Red Sea, Pacific. 



