156 CERAMIACEAE 
Echinoceras Kiitz. loc. cit. 731, 736. 
Acanthoceras Kiitz. loc. cit. 731, 739. 
Chaetoceras Kütz. Bot. Zeit. 5: 34. 1847. 
Trichoceras Kiitz. Sp. Alg. 680. 1849. 
Celeceras Kiitz. loc. cit. 683. 
Pteroceras Kiitz. loc. cit. 690. 
CERAMIUM RUBRUM (Huds.) Ag. loc. cit. xxvii. J. Ag. 
Anal. Alg. Cont. 2: 37. 1894 
Conferva rubra Huds. КІ. Angl. 486. 1762. J. Е. Sm. Eng. Bot. 
pl. 1166. 1803. Dillw. Brit. Conf. 78. pl. 34. 1803. | 
On Mytilus (?) shells, Pescadores Islands, region of Апсбп, 
Feb. 12, 1907, Coker 78, “small, but common, brownish green.” 
The specimens are tetrasporic, only 2-3 cm. high, and are probably 
young. The apices are strongly involute-forcipate, often suggest 
ing in this respect Kiitzing’s figure* of his Ceramium involutum 
from Cape Horn, but involute-forcipate apices are sometimes found 
in Ceramium rubrum as limited by modern writers. Ceramium | 
| involutum. Kiitz. was опсеј doubtfully cited by J. Agardh as 
to have ignored it in his later writings and we do not find the name 
mentioned in De-Toni’s “Sylloge Algarum." The internodes of 
Dr. Coker's plant are short’ and the corticating cells are nearl 
in his later references to the variety or species. De Сапдойе | 
based his species chiefly upon the pedicellate character of the cysto- « 
carps (?) and describes the "articulations" as “formées par de 
cellules arrondies” and the “intervalles” аз “formées par des 
* Tab. Phyc. 13: pl. 6. f. a, b. 1863. 
1 Sp. Alg. 2: 128. 1861. 
