112 gelidiacej:. v. 



Nearly related to Gracilaria, from wliicli it chiefly differs in the constricted coral 

 or cactus-like frond. 



1. CoRALLOPSis Salicornia, Grev. ; frond from the base articulato-constricted, 

 di-trichotomous, articulations swollen upwards, club-shaped, three or four branches 

 springing from the summit of each. J. Ag. Sp. Alg. 2, p. 582. Sphcerococcus Sali- 

 cornia, Ag. Ic. Ined. t. 8. 



Hab. Unalaschka, Chamisso. 



Frond 5 — 6 inches long, articulate throughout ; the articulations an inch long, 

 very slender at the base, gradually swollen upwards, truncate and slightly hollowed 

 at the apex. From the summit of each joint spring three or four similar articula- 

 tions, and thus the frond lengthens proliferously. Substance when moistened 

 fleshy, when dry cartilaginous. 



This curious plant I only know through the figure and descriptions above quoted. 



Order V. GELIDIACE^. 



Hypneacece, Gelidiece and Solieriea?, J. Ag. Sp. Gen. and Ord. Algarum, pp. viii. ix. 

 xi. Part of Cryptonemece and Sphasrococcoideai, J. Ag. Alg. Medit. Endl. 'id. Suppl. 

 Harv. Man. Ed. 2. cj-c. 



Diagnosis. Purplish or blood-red sea-weeds, with an inarticulate, cartilaginous 

 or horny, filiform or flattened frond ; the axis (at least) composed of longitudinal 

 confervoid filaments ; the superficial cellules minute. Conceptacles half immersed, 

 prominent towards one or both surfaces. Spores attached either to a net-work of 

 slender filaments filling the cavity of the conceptacle, or to a fibro-cellular placenta 

 which either adheres to one wall of the cavity, or runs through its centre, dividing 

 it into two loculi. 



Natural Character. Boot either discoid or branching. Fronds almost always 

 tufted, often very densely so, and sometimes forming inextricable matted or pulvi- 

 nate masses, mostly filiform, either cylindrical or compressed, rarely flattened and 

 somewhat leaf-like, generally much branched. The ramification is commonly pin- 

 nate, the frond often many times compounded ; sometimes it is irregularly alternate 

 or secund, rarely and very imperfectly somewhat dichotomous ; sometimes the 



