NEW MYXOPHYCEAE FKOM PORTO RICO 



11 



or loss contiimoiis stratum; cells 3 n diam. without the tegument, 

 spherical, bright aenigiiious, 7-8 m diam. with tegument, homo- 

 geneous; tegument hyaline, homogeneous, the younger tegu- 

 ments more dense than the older. 



Growing in close association with certain species of filamen- 

 tous ]\lyxophyceae on limestone near Hato Arriba, Arecibo, no. 

 1406 a, type, and no. 1397 a. 



The collection of Gloeocapsa mentioned above seems very 

 close to G. livida (Carmich.) Kuetz., judging from the descrip- 

 tions and illustrations of Kuetzing, Hassall, and Meneghini. In 

 its present state of development the cells, in a large part, gravi- 

 tate from each other after each division, l)ut remain within the 

 same colonial tegument. Generally they are to be found in 

 groups of four. Certain other colonies may contain as many as 

 sixteen cells before disintegration of their teguments. In the 

 description of G. livida it is stated that the families contain 

 "16-24 cells." 



Gloeocapsa calcicola sp. nov. 



Plate 2, figure 2-i 



Cells associated into families of 2-4 or rarely 8, spherical to 

 slightly elongated before division, 1.1-1.3 m diam. without tegu- 

 ment, pale aeruginous, homogeneous ; families of four, 10-12 \\ 

 diam. with tegument, cuboidal, with rounded corners; tegument 

 hyaline, faintly lamellose. 



Growing on limestone at Hacienda, Laguna Tortuguero, no. 

 866, type; on a wall in company with other species of Myxo- 

 phyceae, together forming a thin, dark stratum at the Hotel 

 Nava, Santurce, no. 53 a. 



This is one among the most diminutive species of the genus. 

 It is very closely related to certain species of the genus CJiroo- 

 coccus, and it is dilhcult to state the distinguishing characteris- 

 tics of such border-line organisms. This is particularly true of 

 the material of no. 55 a, Avhich is not absolutely identical with 

 the type, no. 866, but too close to be separated specifically. 



Gloeocapsa ovalis sp. nov. 



Plate 2, figure 25 



Cells adhering into small families, rarely containing more 

 than 4 cells, associated with other species of algae forming a 



