OSCILLATOEIACEiE. 
105 
distinct. To judge by the characters assigned by him, many appear very closely allied 
to each other. 
1. Calothrix confervicola , Ag. ; filaments short, glaucous, opake, filiform, blunt, 
rigid, straight or slightly curved, minutely tufted. Ag. Syst. p. 70. Harv. Phyc. 
Brit. t. 254. Wyatt, Alg. Damn. No. 229. Leibleinia confervicola , Endl. 3 d. Supp. 
p. 221. Leibleinia chalybea , Kutz. Sp. Alg. p. 277. (and probably other species of 
Leibleinia of the same author). Conferva confervicola , Dillw. Conf. t. 8. E. Bot. t. 257 6. 
Hab. On the filiform marine Algae. Ehode Island shores, Professor Bailey , 
Mr. Olney , Mr. Hunt. (v. v.) 
Filaments about the tenth of an inch long, either forming little starry tufts along the 
branches of the Alga it infects, or, by the confluence of several such tufts, covering the 
branch with a continuous pile of dark aeruginous-green threads. When seen under the 
microscope the filaments are simple, curved, filiform, but little attenuated upwards, and 
either separate from each other or variously combined by lateral cohesion into fascicles. 
Their cell-wall is rather thick, and the endochrome within is of a dull bluish-green, here 
and there interrupted and broken into separate masses, and sometimes nodoso-incrassate 
at short intervals. The transverse striae are more or less distinctly seen according to 
the age of the specimen examined. The colour varies in different specimens, from dull 
to bright green ; and is sometimes olivaceous, and even yellowish or pale. 
This species is a common parasite on the filiform Algae, and found in many distant seas. 
2. Calothrix scopulorum , Ag. ; spreading in velvetty dull-green strata of indefinite 
extent ; filaments flexuous, subulate, subattenuate, simple. Ag. Sp. Alg.p. 70. Harv. 
Phyc. Brit. t. 58, B. Schizosiphon scopulorum , Kutz. Sp. Alg. p. 329 (and probably 
others.) Conferva scopulorum , Dillw. Conf.p. 39, Sup. t. A. E. Bot. t. 2171. 
Hab. Eocks near high water mark. Shores of Ehode Island, Professor Bailey and 
Mr. Olney. (v. v.) 
This occurs in slimy and somewhat velvetty patches of indefinite extent, covering the 
surface of marine rocks. The filaments rise from a slimy debris or matrix, which is 
gradually accumulated. They are erect, flexuous, often very much bent, attenuated to 
the apices, and sometimes, but not invariably, acuminate ; and they stand in the stratum 
parallel to each other, crowded together, but not cohering in laminae. The endochrome 
is commonly of a dark, olivaceous green, and the cell- wall thin and membranous. Strioe 
evident. 
Generally dispersed throughout the temperate zones, both north and south. Its 
slimy patches are very treacherous to the feet of unwary trespassers who may happen 
to tread on them. 
p 
