I 111. LLG M. "I BERMUDA. 23 



MlCROCOLEUS DeSIlKlzii'! 



1. Terrestrial. 3. M. vaginatus. 



1. Marine. 2. 



2. Trichomes 2.6-6 fi diam. 1. M. chthonopL 



2. Trichomes 1.5-2 /z diam. 2. M. tenerrimus. 



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

 XIV, figs. 5-8; P. B.-A., No. L854. 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. chthvHophixtes, less commonly among 

 other small algae. 



*3. M. VAGINATUS var. MOXTicoLA 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 m diam., rarely to 16 /x; 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 doll green or yellowish; sheaths irregular, becoming 



shapeless and diffluent. 3. H. glutinosum. 



1. H. comoides Gomont, 1893, p. 73, PI. 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. S-10; P. B.-A., No. 205S. Farlow, fide Gomont, 1. c. ; occasional 

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



3. H. glutixosum Gomont, 1S93, 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. calcicolji. 



*1. S. vaginata Gomont, 1S93, p. 40, PI. VII, figs. 1-4. In a 

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

 rington Sound, Nov., Hervey. 



