224 CALOTHRIX. 



lation. Tube continuous ; endochrome green, densely amm- 

 lated, at length dissolved into lenticular sporidia. Name, 

 *AOJ, beautiful, and fyj|, a hair; the filaments being very 

 slender and delicate. 



1. C. confervicola, Ag. ; filaments minute, glaucous, erect, 

 subulate, rigid, tufted. Harv. Phyc. Brit. t. ccliv. ; Harv. 

 in Hook. Br. Fl. ii. p. 367. Conf. confervicola, Dillw. t. 8 ; 

 E. Bot. t. 2576 ; Wyatt, Alg. Danm. No. 229. 



On marine, filamentous Algae; very common. Filaments 1 or 2 lines 

 high, rigid, forming scattered or continuous tufts. " Internal mass at length 

 consolidated into lenticular sporidia, which escape at the end of the tube, 

 either singly or cohering in short cylinders." Cann. MS. cum icone. 



2. C. Mucor, Ag. ; " filaments hyaline, rigid, straightish, 

 erect, forming olivaceous green tufts." Ag. Syst. Alg. p. 70 ; 

 Harv. 1. c. p. 367. 



On marine Algae, at Brighton, Mr. Borrer. Unknown to me. 



3. C. luleola, Grev. ; " filaments hyaline, yellowish, ex- 

 ceedingly slender, elongated, flexible, scattered." Grev. 

 Crypt. Fl. t. 299; Harv. I. c.p. 367. 



On marine filiform Algae, rare. Appin, Capt. Carmichael. " Plant of a 

 pale yellowish colour, investing the stems of the filiform Algae with its nu- 

 merous filaments, and giving them a most delicate, feathery appearance." 

 Grev. Capt. Carmichael thus describes the plant in his MSS. under the 

 name of C. melaleuca. " Filaments in small tufts, a line or two in length, 

 exceedingly slender, tortuous, tapering, of a snow-white colour, and so 

 opaque as to appear intensely black when viewed against the light. Most 

 of them are variegated with pellucid fasciae, caused by the destruction or 

 escape of the colouring matter. In the water, this minute parasite gives a 

 downy appearance to the plants on which it grows." Carm. MS. 



4. C. scopulorum, Web. and Mohr ; filaments minute, 

 erect, curved, flexuous, simple, sub-attenuate, dirty green, 

 agglutinated at the base, forming a continuous, velvety stra- 

 tum. Harv. in Hook. Br. Fl. ii. p. 368 ; Harv. Phyc. Brit. 

 1. Iviii. B. Conf. scopulorum, Dillw. t. A. ; E. Bot. t. 2171. 



On marine rocks, near high-water mark, common ; spreading in dark 

 green slippery patches. The filaments are a line in height, flexuous, 

 slightly attenuated to a subacute point, simple, slimy at the base, and un- 

 der the microscope of a dull yellowish green ; striae indistinct. 



5. C. fasciculata, Ag. ; filaments erect, very straight, dark 

 green, subulate, with a setaceous point, fasciculately pseudo- 

 branched, forming a continuous, velvety stratum. Harv. in 

 Hook. Br. Fl. ii. p. 368 ; Harv. Phyc. Brit. t. Iviii. A. 



Marine rocks, below high-water mark. Miltown Malbay. Stratum very 

 dark shining green. Filaments 2 or 3 lines high, tufted, erect, straight, 



