V. GELIDIACE.E. 125 



I have not seen any American specimens of this plant, which I know only from 

 Australian and Mauritian examples. 



4. Hypnea coimuta, J. Ag. ? frond decompound, irregularly much branched ; 

 branches widely spreading, both larger and smaller laxly set with scattered, 

 spirally inserted, divaricating, broadly subulate, acute ramuli, which are either 

 simple or forked, and occasionally fasciculate ; ends of the branches sometimes 

 naked, straight." /. Ag. Sp. Alg. vol. 2, p. 449. 



Hab. Key West, Prof. Tuomej/, (7 and 33"), St. Croix, Miss Dix. 



Frond (in my specimens) three to four inches long, as thick as sparrow's quill, 

 attenuated upwards, very iiuich branched ; the branches alternate or secund, one or 

 two lines asunder, short and long irregularly mingled together, widely spreading 

 with obtuse axils, decompound three or four times ; their apices produced and some- 

 what bare of ramuli, straight, simple or dichotomous. Ramuli more or less copious, 

 scattered along the larger and smaller branches, very patent or divaricate, half a 

 line to a line long, subulate, rising from a broad base, very acute, simple or forked, 

 sometimes two or three from the same point. Colour a full dark red. Subsianee 

 cartilaginous. 



I have not seen any authentic specimen of Agardh's plant to which I refer the 

 specimens described. His specific character is as follows : — " H. cornuta ; cajspitosa 

 alterne ramosa, ramis extra caaspitem parum porrectis, per totam longitudinem laxe 

 spinulosis apice subdenudato-rectiusculis, spinulis quoquoversum egredientibus 

 patentibus, aliis simplicibus a basi latiore acuminatis rigidis, aliis stellulajformibus 

 vivide rubi'is, capsuligeris rectis spinulis simplicibus obsitis." 



5. Hypnea cervicornis, J. Ag. ; " intricately tufted, sub-decumbent, divaricately 

 much branched and beset with similarly divaricately branched ramuli ; fertile 

 branches projecting beyond the tuft, more densely ramulose, ramuli spreading on 

 all sides, very patent, mostly ramellose ; those bearing tetraspores tumid above the 

 base, ending in a simple or branching point ; those with conceptacles similar." J. 

 Ag. Sp. Alg. vol. 2, p. 4.51. 



Hab. Gulf of Mexico, on the Mexican coast, Liebman,Jide J. Agardh. 



Section 3. Pulvinat.e. Sterile fronds densely pulvinate, intricately much branched, 

 the branches concrete, cohering ;yi??'<//e emerging beyond the matted tuft, not en- 

 tangled together. 



6. Hypnea pannosa, J. Ag. ; sterile fronds pulvinate, intiicately much branched, 

 branches concrete, the exterior ones conical, acuminate ; fertile ones emerging 



