38 COLLINS AND HERVEY. 



material the Oedogonium was less abundant, and except a few loose 

 clusters was all on the Pithophora, which was still uninjured; Rhizo- 

 clonium hieroglyphicum was much more common in this material than 

 Pithophora, but was quite free from the Oedogonium. The nearest 

 relative would seem to be 0. inversum Wittr., which has capitate cells 

 of approximately the same size, and a broadened basal cell, but has 

 cells uniformly 12-14 /z diam., and up to 8 diam. long; rather larger 

 oospores, with quite low division; the basal cell is attached by the flat 

 lower surface, while in 0. consociatum the lower surface is convex, 

 resting in the ring by which it is affixed to the host. 



*3. O. ITZIGSOHNII De Bary ex Him, 1900, p. 177, PL XXVIII, 

 fig. 167; Collins, 1912, p. 86; P. B.-A., No. 1860. In ditch, Devon- 

 shire Marsh, April, Collins. 



Sterile filaments of at least two other species have been found in 

 collections from a roadside pool near Old Ferry Road, Aug., and from 

 a ditch in South Shore marshes, Sept., Collins. 



FAMILY CHAETOPHORACEAE. 

 DIPLOCHAETE Collins. 



D. SOLITARIA Collins, 1901, p. 242; 1909, p. 278, fig. 99. Occa- 

 sional individuals on Laurencia and other algae, never in any abun- 

 dance. 



BLASTOPHYSA Reinke. 



B. RHIZOPUS Reinke, 18S9a, p. 27, PL XXIII; Borgesen, 1911, p. 151, 

 fig. 13; 1913, p. 8, fig. 2; Collins, 1912, p. 99, fig. 12; P. B.-A., No. 

 1905. South Shore, Jan., Hervey; marsh near racecourse, Aug., 

 Collins. At the South Shore in the basal layer of a growth of Sphace- 

 laria tribuloides; at the marsh on Ruppia maritima, among other small 

 algae; in Ulva Laduca, Harrington Sound, Aug., Collins. 



PHAEOPHILA Hauck. 



P. FLORIDEARUM Hauck, 1876, p. 57; 1885, p. 464, fig. 200. Harris 

 Bay, Jan., Hervey. This minute plant occurred among various other 

 algae from a pool, the whole forming a thin, crisp, light gre.en incrus- 

 tation of about the consistency of some thin, encrusting sponge. It 



