122 COLLINS AND HERVEY. 



pointed, the base sharply distinct from the lower sterile part of the 

 ramulus, which is usually about half the diam. of the fertile part; 

 segments of pericentral cells showing indistinctly through the corti- 

 cation in the youngest portions only; dense fascicles of short, unicel- 

 lular rhizoids issuing from all portions of the plant; color pale red; 

 substance rather firm. Type in Collins herbarium, No. 8007, Shelly 

 Bay, Jan. 10, 1913, Hervey; also at North Shore near Wistowe, 

 Jan., Feb., Hervey; dredged in 18 meters, Dec., Collins. 



The cylindrical fronds and the absence of apical pits place this 

 plant in the subgenus Euchondria Falk. ; the abundant rhizoids are 

 of the same type as in the genus Herpochondria, but there is neither 

 the dorsiventral structure nor the lateral adherence of the latter. 

 The rhizoids may occur in short cylindrical fascicles, or may form a 

 dense mass along the frond for a distance equal to several diameters; 

 they may occur on branches of any order, even on the stichidia with 

 mature tetraspores. 



ACANTHOPHOKA Lamouroux. 



A. SPICIFERA (Vahl) Borgesen, 1910, p. 204, figs. 18-19; P. B.-A., 

 No. 1938; A. Thierii Harvey, 1853, p. 17, PI. XIV. A; Fucus spici- 

 ferus Vahl, 1802, p. 44. Aug., Kemp; Rein; Tucker, No. 13; Wal- 

 singham, Farlow; common in quiet waters generally, Jan., March, 

 Oct., Hervey; April, May, July, Aug., Collins. In July and August 

 lying loose on the bottom, but continuing to grow. On submerged 

 tips of live Tamarisk branches, Harrington Sound, Aug., Collins. 



FALKENBERGIA Schmitz. 



F. HILLEBRANDI (Born.) Falkenberg, 1901, p. 689; Borgesen, 1910, 

 p. 199, fig. 17; P. B.-A., No. 2043; Polysiphonia Hillebrandi Bornet 

 in Ardissone, 1883, p. 376. Growing in matted tufts on various algae; 

 Miss Peniston; cave by Ducking Stool, April, cave, Gravelly Bay, 

 Aug., Dec., Gibbet Island, Aug., Bethel's Island, Dec., Collins; Har- 

 rington Sound, Oct., Nov., Dec., cave, Gravelly Bay, Dec., Hervey. 

 In the plants collected at Gravelly Bay in December, were found 

 tetraspores, which have not before been recorded for the species; 

 they are tripartitely divided, and formed from one of the pericentral 

 cells of a ramulus, quite as in Polysiphonia, but occurred singly, not 

 in series. 



