THE ALGAE OF BERMUDA. 131 



cells; with few elongate branches, bearing patent, acute ramuli, the 

 younger with a dense fascicle of ramelli at the tip, the older naked; 

 ramelli very dense, deciduous, monosiphonous, dichotomous, straight, 

 not divaricate; cells 2-3 diam. long, above only 1 diam.; diameter 

 the same throughout; stichidia conical or cyclindric-conical, arising 

 near the base of a fascicle of ramuli ; tetrasporangia 2-4 in a whorl. 

 Substance of the frond firm; color dark red. Type in Collins her- 

 barium, No. 7243; collected at Shelly Bay, May 4, 1912, Collins. 

 When ramelli are abundant, this plant somewhat resembles D. punicea, 

 but the ramelli show no tendency to a verticillate arrangement, and 

 fall off more easily. The surface of the frond after the ramelli have 

 fallen is smooth and even, not knotted and irregular as in D. punicea; 

 the cells are small and regular, not large and irregular as in that species. 



4. D. PUNICEA Meneghini in Zanardini, 1842, p. 171; 1865, PL 

 LIT. Dingle Bay, March, Hervey; Bethel's Island, Dec., Collins; 

 both with tetraspores. In habit somewhat resembling D. pedicellata, 

 but the ramelli are larger, of longer cells, and with a distinct tendency 

 to issue in whorls. 



5. D. ARBUSCULA (Dillw.) Agardh, 1828, p. 121; Harvey, 1846-51, 

 PI. CCXXIV; P. B.-A., No. 1944; Conferva arbuscula Dillwyn, 1809, 

 PI. G. Shelly Bay, Jan., Smith's Bay, March, Harris Bay, April, 

 Hervey; Hungry Bay, April, in dense floating masses and attached to 

 mangroves, Collins. 



6. D. RAMOSISSIMA Harvey, 1853, p. 61 ; Kiitzing, 1864, PL LXIX, 

 figs, cl-e; P. B.-A., No. 1945. On vertical rock between tides, Pink 

 Beach, Jan., Feb., Smith's Bay, March, Gibbet Island, Dec., Hervey. 

 In habit not unlike D. corymbifera, but the divisions of the ramelli are 

 incurved. 



7. D. CORYMBIFERA J. G. Agardh, 1841, p. 31; D. venusta Harvey, 

 1846-51, PL CCXXV; D. arbuscula P. B.-A., No. 1097b, not 1097a; D. 

 arbuscula forma subarticulata P. B.-A., No. 493. Washed ashore from 

 deep water, Buildings Bay, Feb., Hervey; dredged in 4 m., Nov., 

 Collins. Sometimes confused with D. arbuscula which it resembles 

 in habit; both have a dense coating of divaricately branching ramelli, 

 but in D. corymbifera the tips of the ramelli are much more slender 

 than their bases. 



HETEROSIPHONIA Montagne. 



H. WURDEMANXI (Bailey) Falkenberg, 1901, p. 638, PL XVI, fig. 11; 

 P. B.-A., No. 2097; Dasya Wurdemanni Bailey in Harvey, 1853, p. 64, 

 PL XV. C. Cooper's Island, Feb., Farlow; Harrington Sound, Jan., 



