NEW MYXOPHYCEAE FROM PORTO RICO 



13 



The variety is to be distinguished from the species in having 

 larger and ellipsoidal colonies, in having elongated cells and in 

 having yellowish-brown tegument on the surface of the stratum 

 when aged. The cells are distinctly elongated, a character not, 

 strictly speaking, that of a typical Gloeocapsa, but the cells 

 divide in three planes, thus excluding it from the genus Gloeo- 

 thece. 



Gloeothece interspersa sp. nov. 



Plate 3, figure 28 



Families more or less ellipsoidal, small, interspersed in the 

 interstices of filamentous algae and fungi, composed of 2-4 or 

 rarely 8 cells; families of 2 cells 13-15 m long, of 4 cells 16-18 n 

 long; single cell cylindrical, with rounded ends, 3.6-4 m diam., 

 7-7.5 |i long without the tegument, pale aeruginous ; tegument 

 hyaline, relatively wide, lamellose. 



Growing on a wall by the Hotel Nava, Santurce, no. 54 a, 

 type. 



Gloeothece endochromatica sp. nov. 



Plate 3, figure 29 



Colonies very small, 15-25 \i diam., containing 16-32 or more 

 cells, spherical to more or less lobed; cells 0.9 to 1.2 m diam., 

 1.5-2 times as long as the diam., pale aeruginous to yellowish 

 green; colonial tegument hyaline or slightly opalescent; single 

 cells, or groups of 2 or more, surrounded by a relatively firm, 

 very distinctly delimited, thick, dark-violet tegument, but not 

 lamellose ; as the cells become aged the color disappears in part. 



Growing among other species of Myxophyceae on limestone, 

 between Arecibo and Utuado, no. 1465 a, type. 



The above-described species of Gloeothece structurally is on 

 the border between the genera Anacystis and Gloeothece. The 

 special or individual teguments appear to be fused with the gen- 

 eral colonial tegument at times, as it does in some species of 

 Anacystis but apparently no resting spores are produced, at 

 least none could be found in the material under the stage of de- 

 velopment in which it was found. It is also very closely related 

 to certain species of Gloeocapsa of the Cyanocapsa section, but 

 the presence of cylindrical cells which seem to divide in but one 



