40 COLLINS AND HERVEY. 



in secund series, passing around the host; in older plants the branching 

 may be quite dense, with no regularity discernible. The wall is very 

 thin in the younger cells, but becomes quite thick in the older; the 

 chromatophore is dense, and nearly or quite covers the wall. Bristles 

 appear to be rare, and those we saw were short, evidently broken off. 

 In the oldest parts of the plant, most of the cells had become sporangia, 

 many of them had emptied, and only one was seen containing spores; 

 these appeared spherical, but no details could be made out from the 

 formalin material. The host has thick, distinctly laminate walls, 

 and the Endoderma seems to push apart the laminae without difficulty; 

 in one case two plants were seen, one outside the other, separated by 

 one of the laminae of the host. In another case a plant was seen 

 quite on the outside of the host wall ; in this the cells were quite small 

 and spherical; it seems probable that the lamina of the host under 

 which they grew had peeled off, and the cells took the unusual form 

 on release of the pressure. 



Pringsheimia Reinke. 



P. scuTATA Reinke, 1889a, p. 33, PL XXV; Collins, 1909, p. 288, 

 fig. 9.5. On JVurdcmannia, Gibbet Island, Aug., Collins; on Ulva, 

 Harrington Sound, Aug., Collins. 



MiCROTHAMNiON NagcH. 



*M. KuETZiNGL\NUM Nageli in Kiitzing, 1849, p. 352; Hazen, 1902, 

 p. 191, PI. XXVI, fig. 1; Pi. XXVII, figs. 2^; Collins, 1909, p. 294. 

 Among Tdraspora lubrica, on dead leaves in ditch in Devonshire 

 Marsh, Dec, Collins. 



Urococcus Kiitzing. 



*U. iNSiGNis (Hass.) Kiitzing, 1849, p. 207; Wolle, 1887, p. 201, 

 PI. CXXIII, figs. 11-12; Collins, 1909, p. 306; P. B.-A., No. 1862; 

 Haematococcus insigjiis Hassall, 184.5, p. 324, PI. LXXX, fig. 6. 

 Among Sphagnum in Devonshire Marsh, April, Collins. 



Gloiococcus X. Braun. 



*G. Mucosus A. Braun, 1851, p. 170; Collins, 1909, p. 310, fig. 122. 

 Among Oedogonium etc., in ditch in Devonshire Marsh, April, Collins. 



