PL cell, aph. 2.THALASSIOPHYTbE. 29. Callith. 327 
long as broad; thecae reverse ovate, pedicelled, solitary; 
pedicells short, in the forks. 
Conferva pedicellata, Engl. Hot . 1817 ; DlUw. Conf. [08. 
Sea-shores. 
Thallus 2 inches high, forming straight, stilt tufts of a 
very pale dull rose-colour. 
V. 30. CERAMIUM. Agardh. Horn-weed . 
Thallus rose- red, threadlike, jointed, forked, branched; 
joints (solid ?) when magnified coloured in fine network ; 
thecce ovate, lateral, involucrated with the short branches, 
1. Ceramium rulrum. Red horn-weed. 
Threads very much branched, red, cartilaginous; twigs 
bristlelike, forked at the tip ; joints ovate, about as long as 
broad ; knots contracted. 
Conferva marina geniculata ramosissima lubrica, longis sparsisve ra- 
mul is, Dillen in Raii Syn. 61. S3. 
Conferva rubra, Ifuds. FI. Angl. 600 ; Diltu . Conf. S i. 
Conferva nodulosa, Liglilf. Scot. 094. 
Conferva fiosculosa, Ellis Phil. Tr. 57,425. 
Ceramium virgatum, Roth Cat. 1. 
Ceramium elongatum, Roth Cat. 2, 178. 
Ceramium riibrum, Agardh Syn. 60. 
Ceramium diaphanum purpureum, Roth Cat. 2,228. 
Fucus Lagasca, Clem. Ens. 315. 
Parasitic on other sea-plants. 
Tufts dark red, becoming yellow by decay; joint pel- 
lucid in the centre. 
j3. maculatum. Thallus small, thin ; joints with a dark 
central spot. 
2. Ceramium diaphanum . Transparent horn-weed „ 
Thallus threadlike, very much branched, rather mem- 
branaceous, variegated with transparent and purple; twigs 
forcepshape at the tip ; joints cylindrical, hyaline; knots 
elevated, coloured. 
Conferva marina nodosa lubrica ramosissima et elegantissima riibens, 
Dillen in Rail Syn. 62, 25. 
Conferva diaphana, Lightf. Scot. 996 ; Engl. Bot. 1742. 
Conferva nodulosa, Hitds. FI. Angl. 600. 
Conferva elegans, Roth Cat. 1. 
Conferva fastigiata, Roth Cat. 2, 224. 
Conferva globulosa, Roth Cat. 2, 233. 
Conferva moniliformis, Roth Cat. 2,236. 
Ceramium diaphanum, Roth Cat. 3, 154. 
Ceramium forficatum glabellum, De Cand. FI. Fr. 2, 46. 
