THE ALGAE OF BERMUDA. 15 



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

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

 teriana. Gloeothcce 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, 1.5-2ju diam.; tegument yellow or brown. 



1. G. fusco-lutea. 



1. Cell without wall, over 2 n 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 /j. diam. 



3. G. atrata. 



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

 2153. G. ambigua 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, PL XIX, 

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



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

 lina air aia Turpin, 1830, PL 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 ju diam., 

 containing only two cells, to above 140 n 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 /* wide. 1. G. confluens. 



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



*1. G. CONFLUENS Nageli, 1849, p. 58, PL 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; 

 Palmetto, rupestris Lyngbye, 1819, p. 207, PL LXIX, fig. D; G. mem- 

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



