SYNOPSIS OF THE SPECIES. XXXV11 



338. percursa; capillary, entangled, simple, compressed, subsolid, reticulated ; 

 cells quadrate, two or more in the breadth of the frond; endochrome 

 filling the ceU. (Tab. CCCLII.) 



339. Ralfsiij capillary, simple or nearly so, subsolid, largely reticulated ; areoles 

 large, hyaline, 2-4 in the breadth of the frond, each containing a bright- 

 green grain of endochrome. (Tab. CCLXXXII.) 



XCVI. ULVA. 



340. latissimaj frond broadly ovate or oblong, membranous, full-green. 

 (Tab. CLXXI.) 



341. Lactuca; frond very delicate, at first saccate; then cleft to the base into 

 numerous laciniated flat segments. (Tab. CCXLIII.) 



342. Linza; frond linear-lanceolate, undulate. (Tab. XXXIX.) 



XCVII. PORPHYRA. 



343. laciniataj frond deeply and irregularly cleft. (Tab. XCII.) 



344. vulgaris; frond simple, lanceolate, wavy. (Tab. CCXI.) 



344.* P. miniata,Ag. — Carm. Hook. Br. Fl. v. ii. p.310. (Unknown to me.) 



XCVIII. BANGIA. 



345. fuscopurpurea ; stratum brownish-purple; filaments long, simple, decum- 

 bent, here and there constricted ; granules several in each transverse band. 

 (Tab. XCVI.) 



346. ciliaris ; filaments very minute, erect, simple, straight, compressed, purple ; 

 grains two or three in each transverse band, globose, sometimes solitary. 

 (Tab. CCCXXII.) 



347. ceramicolaj filaments parasitical, very slender, elongate, rosy ; articula- 

 tions once or twice as long as broad, longitudinally striate ; the endochrome 

 at length globular. (Tab. CCCXVII.) 



348. carnea, Dilhv. t. 84. (Unknown to me.) 



349. (?)elegansj filaments minute, dichotomous, with wide axils; granules 

 binate, in a single row. (Tab. CCXLVI.) 



Order 17. OSCILLATOBIACEiE. 



XCIX. RIVTJLARIA. 



350. plicataj fronds gregarious, gelatinous, plaited, often hollow and at length 

 ruptured, dull dark green; filaments wavv, associated in dichotomous scries. 

 (Tab. CCCXV.) 



351. atra; globose, minute, very firm and smooth, glossy, black-green; fila- 

 ments densely packed. (Tab. CCXXXIX.) 



352. applanata, Carin. in Hook. Br. Fl. vol. ii. p. 892. (Unknown to me.) 



353. nitida; frond subgelatinous, lobed and plaited, hollow, lubricous, dark 

 shining green. (Tab. LXVII1.) 



C. SCHIZOSIPHON. 



354. Warrenise. (TAB. CCCXVI.) 



CI. SCHIZOTHRIX. 



355. Cresswellii; tufts pulvinate ; filaments very slender, fastigiate, collected 

 into branching bundles. (Tab. CLX.) 



e 



