IV. 
ECTOCARPACEfE. — Sphacelakia. 
137 
1. Sphacelakia cirrhosa, Ag. ; stems naked at the base, short, densely tufted, 
simple or branched, pinnate or bipinnate ; pinna? opposite, alternate or irregular, 
simple ; spores globose, scattered, sessile or shortly stalked. J. Ag. Sp. Alg. 1, y». 
34. Kiitz. Sp. Alg. p. 464. Harv. Phyc. Brit. t. 178. Conf. pinnata , E. Bot. t. 
2330. ( right hand Jig.) 
Hab. On the small Alga? between tide-marks. Long Island Sound, Captain 
Pike. Ship Ann Point, Con. Messrs. Walters , Hooper , and Congdon. New Bedford, 
Mass. Mr. Congdon. 
Fronds forming globose, fastigiate tufts, an inch or rather more in diameter ; more 
or less densely tufted, scarcely fastigiate, and only a quarter inch in height. Filaments 
capillary, of equal diameter throughout, straight, once or twice pinnated, the pinna? 
very irregular ; in some specimens closely set, opposite and plume-like, in others 
distant, alternate, variable in length on the same branch ; either erecto-patent or 
spreading horizontally, simple, naked, blunt. The spores are not uncommon, and 
are found scattered along the pinnae. Colour a foxy brown or olive. Substance 
rigid, scarcely adhering to paper in drying. 
Probably common on the shores of the Northern and Midland States. Numerous 
specimens that I have received are very similar to European forms of this variable 
plant. 
2. Spiiacelaria radicans , Dillw. ; filaments decumbent, sending out fibrous radi- 
cles in the lower part, with a few irregular, simple, straight, naked branches ; 
spores clustered, sessile. Harv. Phyc. Brit. t. 189- S. olivacea , J. Ag. Sp. Alg. 
vol. 1, p. 30. S. radicans and S. olivacea , Kiitz. Sp. Alg. pp. 463, 466. Conf. 
olivacea , E. Bot. t. 2172 ; and C. radicans , t. 2138. 
Hab. On sand-covered rocks, between tide-marks. (I gathered on rocks at 
Beverley, on Boston Bay, what I supposed to be this species ; but have mislaid my 
specimens. W. II. H). 
A small plant, forming spreading patches half an inch in height, and two inches 
or more in diameter. The specific name radicans, though not adopted by Prof. 
Agardh in his recent work, has evidently the claim of priority, having appeared in 
English Botany 34 plates earlier than the rival name olivacea — a name moreover, 
equally applicable to any other species of the genus, all being olive-colourecl. 
VOL. hi. art. 4 . 
T 
