T. H. BUFFHAM ON ANTHERIDIA. 293 



portions of the thallus. They are white, '6-'S mm. in diam., 

 and visible to the unassisted eye (Fig. 5). The surface view 

 shows the exterior of this minute ball to be made up of groups 

 of more or less circular spaces from which the inner arcs are 

 absent, and thus there are formed areas of roughly elliptical 

 outline. From the sides of these tufts of minute filaments 

 spring which produce at their extremities the pollinoids (Fig. 

 6). A vertical section shows that one of these areas is but the 

 exterior view of a cavity which has a depth down to 200 /x, with 

 a w^idth of 50-80 /x. Moreover its depth also appears to be 

 made up of a number of cavities that are segments of hollow 

 spheres, and from each of these also spring tufts of filaments 

 like those seen near the surface (Fig. 7). (Deal, September, 

 1891, collected by Mr. Neeve. Also by Mr. E. A. Batters, at 

 Berwick, October, 1889.) In my previous paper (loc. cit.) there 

 are figures (PI. XVI) of the antheridia of Ph. memhranifolia 

 J. Ag., and it will be obvious that they differ enormously from 

 those of Ph. ruheiis. I venture to think this would justify the 

 resumption of Kiitzing's name for the former — Phyllotylus 

 membranifolius. The antheridia of Phyllophora rubens have 

 been incidentally mentioned by Thuret and Bornet in their 

 jStudes Phycologiques, p. 82. 



Gystoclonium purpurascens Kiitz. (Rypnce purpuratscens 

 Harv.) — In this filamentous plant a careful examination with 

 the microscope will only show on some of the uppermost 

 ramuli a surface with a rather less vivid colour, and a very 

 narrow hyaline border projecting a little. A transverse section 

 shows the cells just below the ordinary cells dividing vertically 

 and these producing the pollinoidiferous cells surmounted by a 

 gelatinous arch. Amongst these are some unchanged cortical 

 cells (Fig. 8). (Swanage, August, 1890.) 



In my last paper (p. 251) I mentioned PhodophylUs appendi- 

 culata J. Ag. I then thought I had the antheridia, but I now 

 consider this doubtful. 



Sphcerococcus coronopifolius Stackh. — On this species, copiously 

 furnished with cystocarps, I had long noticed, on the surface of 

 the compressed thallus, numerous minute spots, more lucid 

 than the ordinary cortical cells, without ascertaining their true 

 nature. They are most numerous at some little distance below 

 the apices of the plant. Collecting some specimens (Wey- 



