202 SYNOPSIS OF BRITISH SEAWEEDS. 



branoufl tube j cells lenticular; the connecting oells larger, 



compressed," Ktz. Phyc. Gen. p. 213. (Atlas, PL I AW. 



Fig. 381.) 

 Hah. In muddy brackish ditches. 



The presence of a membranous tube to the filament, 

 alone distinguishes this genus from Sphcerozyga. 



3S7. Harvey ana (Harvey's Spermosira) ; " filaments much 

 carved, composed of cells nearly as long as broad ; spores 

 exactly spherical, almost twice the diameter of the cells ; 

 connecting cells subquadrate, rather longer than wide, and 

 of the same width as the ordinary cells," Thw., Hare. Phyc. 

 Brit. pi. 173, C. (Atlas, PL LXXX. Fig. 381.) 

 Hah. Occurring intermixed with Sphcerozyga Broomei^ at Shire- 

 hampton, near Bristol. 

 "This beautiful species differs from Spermosira littorea 

 in its spores being not at all compressed, and its ordinary 

 cells much longer compared with their width. The mem- 

 branous sheath investing the filament is with difficulty seen, 

 and the plant bears considerable resemblance to some 

 species of Sphcerozyga. The curved filaments and spherical 

 spores render it not very unlike Monwmia intricata, Berk., 

 from which it is however perfectly distinct." — Thw. 



Okdeb 19. PALMELLACEJE. 

 CX. HORMOSPORA. 



388. ramosa {The branched Hormospora) ; filaments branched ; 

 endochrome radiated, Thw. (Atlas, PL LXXYI. Fig. 360.) 

 Hob. Growing attached to the filaments of Cladophora fracta in 

 a salt-water lake near Wareham, Dorsetshire. 

 This pretty species bears a considerable resemblance to 

 Hormospora mutabilis, Brebisson ; it differs however in 

 its filaments being branched instead of being simple as in 

 that species. In H. mutabilis the young cells are described 

 as being subspherical, and the endochrome is stated to be 

 lamellose ; whereas in the present species the endochrome 

 is radiated, and the immature cells are nearly cylindrical. 

 H. mutabilis occurs in fresh- water ponds ; whilst this in- 

 habits a salt-water lake, to which the sea has access oc- 

 casionally. 



