THE ALGAE OF BERMUDA. 35 



latissima; in high pool near Tucker's Town, April, Collins; in quiet 

 waters elsewhere, but less common than var. rigida. 



Var. RIGIDA (Ag.) Le Jolis, 1863, p. 38; Collins, 1909, p. 215; P. B.-A., 

 No. 2064; U. rigida Agardh, 1822, p. 410. Rein; Kemp, as U. 

 Lactuca; Tobacco Bay, Grasmere, March, Harrington Sound, July, 

 Hervey; Inlet, Aug., Collins. Rather common both in sheltered 

 and exposed places; sometimes quite near to U. fasciata. 



2. U. FASCIATA Delile, 1813, p. 153, PL LVIII, fig. 5; Collins, 1909, 

 p. 216. Miss Wilkinson; Harrington Sound, March, Hervey. Ap- 

 parently not common; not easy to distinguish from forms of U. 

 Lactuca var. rigida, but generally of darker color, especially near the 

 margin of the linear, dentate or crenate lobes; the frond is thicker 

 than in most forms of U. Lactuca, and the cells more elongate verti- 

 cally. 



PROTODERMA Kiitzing. 



P. MARINUM Reinke, 1889, p. 81 ; Collins, 1909, p. 217. On pebbles, 

 North Shore near Inlet, Aug., Collins. Probably common everywhere 

 but inconspicuous. 



FAMILY CYLINDROCAPSACEAE. 

 CYLINDROCAPSA Reinsch. 



*C. INVOLUTA Reinsch, 1867, p. 66, PL VI, fig. 1; P. B.-A., No. 

 2067; C. geminella Wolle, 1887, p. 104, PL XCI, figs. 1-17; Collins, 

 1909, p. 222; C. geminella var. minor Hansgirg, 1886, p. 224, fig. 122; 

 Hormospora geminella, Wolle, 1877, p. 140. In artificial reservoir near 

 Spanish Rock, among Rhizoclonium hieroglyphicum etc., Feb., Hervey. 

 In explanation of the synonymy just given, we must go into a little 

 detail. The genus Cylindrocapsa and the species C. involuta were 

 founded by Reinsch on vegetative characters only; the fructification 

 was discovered by Cienkowski, described and well figured by him, 1876, 

 p. 560, PL IX, figs. 50-65. W T olle, 1877, p. 140, described Hormospora 

 geminella, vegetative characters only; in 1887, p. 104, Cylindrocapsa 

 geminella with description of fructification. PL XCI, figs. 1-17 is 

 supposed to represent the latter, but is not very instructive. No 

 reference is made to Hormospora geminella. Hansgirg, 1886, 7 p. 223, 



7 The date on the first title of the Prodromus is 1886; a second title, intro- 

 ducing a " Schlusswort " with separate paging, is dated 1888; under C. gemi- 

 nella there is a reference to the author's "Phyc. u. algol. Studien, 1887." 



