Calithamnion.] ALGyE CONFERVOlDEiE. 343 



broad, capsules elliptical minute on short lateral processes of the 

 pinna3. — Ag. Sp.Alg. v. 2. p. 179. — Conferva tetrica,Dillw. Conf. 

 t. 81. E.Bot.t. 1915. 



On rocks, generally such as are perpendicular; very common. — 2 — 8 

 inches long, forming dense ropy tufts. In drying, it adheres, but not 

 firmly, to paper; and on being again moistened, is extremely fragile, 

 scarcely able to sustain its own weight. Capsules 1 — 3 on each lat- 

 eral process. Favellce generally in pairs, minute, seated on the plumules 

 and nearly terminal. 



14. C. tetragomun, Ag. ([square-stalked Calithamnion); stem 

 subsimple cartilaginous, branches patent alternate once or twice 

 pinnate, plumules short alternate spreading pinnate below, fas- 

 ciculate! y multifid above, apices obtuse with a mucro, articula- 

 tions of the ramuli once and a half as long as broad, joints 

 contracted. — Ag. Sp.Alg. v. 2. p. 176. — Conferva tetragona, 

 Dillw. Conf. t. 65. E. Bot. t. 1690. 



On the larger Laminavicc, abundant on the southern coasts of Eng- 

 land and south and west of Ireland. — Capsules excessively minute, ses- 

 sile, elliptico-sphscrical, secund on the upper ramuli. Favellce solitary 

 or in pairs, large. 



15. C. graniddtum, Ag. (warted Calithamnion); stem sub- 

 simple cartilaginous distichously branched, branches erecto- 

 patent, plumules subquadrifarious erect pinnate below, multifid 

 and level-topped above, pinnules subulate very erect and close- 

 pressed, articulations of the ramuli twice as long as broad.-*- 

 Ag. Sp. Ala. v. 2. p. 177. 



On the larger Alg<e, probably common. Appin, Captain Carmiehael. 

 Whitsand bay, Mr* 'A molt.— Stems 2—4 inches high, elegantly tufted, 

 thicker than hog's bristle at the base, alternately branched, their outline 

 lanceolate. Colour a brownish-red. Capsules resembling those of ( '. 

 tetragonum, from which the present species is chiefly distinguished by its 

 more erect and level-topped (corymbose) plumules, subulate pinnules 

 and rather longer joints. Our description is taken from Carmichael's 

 specimens; Mr. Arnott's plant from Whitsand bay is smaller, more 

 slender and flaccid. 



16. C. purpurdseent, Sm. (purple Calithamnion)} purplish-red 

 repeatedly branched very slender and tufted, joints Blightly tu- 

 mid thrice as long as broad with pellucid partitions, thoSfl oi the 

 main-Items compound, capsules lateral sessile. Smith. — /:'. But. 



t. 2465. 



"Gathered on the beach at Brighton, bj Mr. \V. Borrer, who thinks it 

 maj r beC,purpurateem of Hudson." 5i».— Of this plant I know nothing, 



nor am I aware of the existence ..I'any authentic specimens. Mr. Bor- 

 rer SUSpectS it may <»nl\ be a I. iTgef specimen of C, TOte*. Agtdrdh i< 



to the B. Bot. figure under bis i '■ versicolor* but that species baa dicho* 



toinous ramuli, and axillary capsules, 



** Phiunihs more or faff ofrovate or jlabeUat e , 



17. ('. fasekuldtum. Efarv. Mss. (tufied Calithamnion); tufted, 



