THE ALGAE OF BERMUDA. 15 



2. C. CKTPTABUM Farlow in P. B.-A., No. 752; Porti, 1907, p. 30. 

 Farlow; on walls and roofs of caves, often in company with C. Rich- 

 teriana. Gldeothece rupestris often occurs in company with these two 

 species, the whole forming a continuous stratum, generally one or two 

 mm. thick, extending from just above low water mark to much above 

 high water mark. Between tide marks it is a rich green and gelatinous, 

 but beyond the range of tides it is yellowish or whitish and crumbly. 



Gloeocapsa Kiitzing. 



1. Cell without wall, 1.5-2 fi diam.; tegument yellow or brown. 



1. G. fusco-lutea. 

 1. Cell without wall, over 2 M diam.; tegument colorless or nearly so. 2. 



2. Colony amorphous, soft; cell without wall, 2-5 n diam. 



2. G. montana. 

 2. Colony subspherical, firm; cell without wall, 4-6 m diam. 



3. G. atrata. 



*1. G. FUSCO-LUTEA (Nag.) Kiitzing, 1849, p. 224; P. B.-A., No. 

 2153. G. amhigua var. fusco-lutea Nageli, 1849, p. 50. On rocks. 

 Hungry Bay, in company with Synechocystis aquatilis, April, Collins. 

 The color of the tegument varies from dark brown to pale yellow. 



*2. G. MONTANA Kiitzing, 1843, p. 173; 1845-49, p. 14, PI. XIX, 

 fig. 2. On wall of cave near Causeway, high up, April, Collins. 



*3. G. ATRATA (Turp.) Kiitzing, 1843, p. 174, PI. VI, fig. 1; Globu- 

 lina atrata Turpin, 1830, PI. V, fig. 6. On cliff, away from the sea, 

 in company with Scytonema etc., Aug., Collins. The colonies are 

 usually quite regularly spherical; they range from about 30 /i diam., 

 containing only two cells, to above 140 /x diam., with hundreds of cells. 

 The contents is bright green, somewhat granular; the surface inside 

 the wall is usually thickly set with very short, bristle-like projections; 

 bacterial? 



Gloeothece Nageli. 



1. Cell without tegument, about 2 n wide. 1. G. confluens. 



1. Cell without tegument, about 5 n wide. 2. G- rupestris. 



*1. G. CONFLUENS Nageli, 1849, p. 58, PI. I. G, fig. 1. On wall 

 of shallow cave, by inland road, April, Collins. 



*2. G. rupestris (Lyng.) Bornet in W. & N., No. 399, 1880; 

 Palmella rupestris Lyngbye, 1819, p. 207, PI. LXIX, fig. D; G. mem- 

 hranacea Bornet, 1892, p. 175. Common all about the islands in 



