( 0LUN8 and BKBVET. 



material the Oedogonium was less abundant, and except a tew ]■ 



clusters was all on the Pitkopkora, which was Mill uninjured; Rhizo- 

 clunium kteroglypkicum was much more common in this material than 



Pithophora, but was quite free from tin- Oedogonium. The nearest 

 relative would seem to he 0. invereum Wittr., which ha- capitate <-clU 

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



cell- uniformly 12-14 /J diain.. ami up to 8 diam. long; rather UU 



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

 lower surface, while in 0. consociatum the lower Burface i- convex, 

 resting in the rini: by which it is affixed to the host 



*3. O. [tzigsohnd De Han ex Him. 1900, ]>. 177, PI XWIII, 

 fin. L67; Collins, L912, p. 86; P.B.-A., No. I860. In ditch. Devon- 

 shire Marsh, April, ( lollins. 



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 CHAETOPHORA* IEAE. 

 Diplochaete Collim. 



D. BOLTTABIA Collins, 1901, p. 212; 1909, p. 27s. fig, 99, Occa- 

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

 dance. 



Blastophysa licit i! 



B. bhizopus Reinke, 1889a, p. 27, PL XXIII; Borgesen, 1911, p. 151, 

 fig. L3j 1913, ]). S, fig. 2; Collins, 1912. p. 99, 6g. 12; P. B.-A., No. 



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

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

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

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



PKAEOPBTLA Ilauck. 



P. FLOBIDEABUU Ilauck, 1876, p. 57; L885, p. 164, fig. 2(10. Harris 

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

 algae from a pool, the whole forming a thin, crisp, light green incrus- 

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



