12 



MEMOIKS OF THE isEW YORK BOTANICAL G.VRDEX 



thin dark stratum on rocks, 5.8-6.2 |j diam. without the tegu- 

 ment, 9-12 n diam. with the tegument, spherical wlien alone, re- 

 maining angular for some time after division, bright aeruginous, 

 homogeneous ; families of two cells 12-14 n long, broadly ellip- 

 soidal, those of 4 cells 14-16 m long; tegument hyaline, more or 

 less lamellose on the family, homogeneous on the single cells. 



Growing on limestone between Utuado and Adjuntas, no. 

 1640, type. 



Gloeocapsa sphaerica sp. nov. 



Plate 3, figure 26 



Families spherical to irregular in outline, containing a vari- 

 able number of cells, up to 128 before the dissolution of the gen- 

 eral tegument, soft, subgelatinous, adhering to each other at 

 times, forming masses microscopic in size; cells spherical to 

 slightly elongated before division, yellowish green, 2-2.3 n diam., 

 usually separated from each other in the colony by 2-3 times 

 their diam. ; tegiunents homogeneous, opalescent, ample, smooth 

 on the surface; teguments of individual cells arising soon after 

 cell division, not persisting long, but merging into the colonial 

 tegument. 



Growing on limestone between Arecibo and Utuado, no. 

 1482 a, type. 



The distinguishing feature of this species of Gloeocapsa is 

 the perfectly spherical form of the young colonies with an ample, 

 homogeneous, opalescent tegument, and not a more or less 

 angular colony, as is the case in most species of the genus in 

 the juvenile stage. It seems closely related to G. squamulosa 

 Breb., which has a thick, hyaline tegument. It differs from that 

 species in having the cells associated into much larger families, 

 with a larger number of cells in the family. 



Gloeocapsa ouaternata major var. nov. 

 Plate 3, figure 27 



Families composed of 2. more rarely of 4, cells, broadly ellip- 

 soidal, 13-15 |j long, closely crowded together but not confluent; 

 cells 3.5-4.2 n diam. and 6.7 n long without tegument, homogene- 

 ous, aeruginous; tegument very distinctly lamellose, hyaline, be- 

 coming yellowish brown with age. 



Growing on the wall of an old conservatory, San Juan, no. 

 131 a, type. 



