THE ALGAE OF BERMUDA. 23 



MICROCOLEUS Desmazieres. 



1. Terrestrial. 3. M. vaginatus. 



1. Marine. 2. 



2. Trichomes 2.5-6 fj. diam. 1. M. chthonoplastes. 



2. Trichomes 1.5-2 ju diam. 2. M. tenerrimus. 



1. M. CHTHONOPLASTES Thuret ex Gomont, 1893, p. 91, PI. 

 XIV, figs. 5-8; P. B.-A., No. 1854. Common among other small 

 algae in incrustations on rocks, and on bottoms of shallow pools; 

 occasionally nearly pure, as a thin, blackish coating; also in fresh 

 water reservoir near Spanish Rock, Hervey. 



2. M. TENERRIMUS Gomont, 1893, p. 93, PI. XIV, figs. 9-11. 

 Occasional filaments among M. chthonoplastes, less commonly among 

 other small algae. 



*3. M. VAGINATUS var. MONTICOLA Gomont, 1893, p. 94. On 

 moist ground at roadside near Flatts Bridge, Dec., Hervey. 



HYDROCOLEUM Kiitzing. 



1. Trichomes 14-24 M diam. 2. 



1. Trichomes 8-14 n diam., rarely to 16 ^; sheaths irregular, gelatinous, 

 often quite diffluent. 2. H. lyngbyaceum. 



2. Color of mass of violet shade; sheaths cylindrical, distinct. 



1. H. comoides. 



2. Color of mass dull green or yellowish; sheaths irregular, becoming 

 shapeless and diffluent. 3. H. glutinosum. 



1. H. COMOIDES Gomont, 1893, p. 73, PL XII, figs. 3-5. Farlow, 

 fide Gomont, 1. c. ; on rocks, Hungry Bay, April, Collins. 



2. H. LYNGBYACEUM Kiitzing ex Gomont, 1893, p. 75, PI. XII, 

 figs. 8-10; P. B.-A., No. 2058. Farlow, fide Gomont, 1. c.; occasional 

 in pools, Collins. The latter resembling var. rupestre Gomont, 1. c. 



3. H. GLUTINOSUM Gomont, 1893, p. 77. Rocks east of Elbow 

 Bay, Dec., Collins, forming a thin, tubercular coating on rocks 

 between tides. 



SCHIZOTHRIX Kiitzing. 



1. Among algae in pools; trichomes 2-3 M diam. 1. S. vaginata. 



1. On damp walls; trichomes 1-1.7 M diam. 2. S. calcicola. 



*1. S. VAGINATA Gomont, 1893, p. 40, PI. VII, figs. 1-4. In a 

 gelatinous mass with other algae, North Shore, Sept., Collins; Har- 

 rington Sound, Nov., Hervey. 



