NEW MYXOPHYCEAE FROM PORTO RICO 



11 



or less contiimons stratnni; cells 3 [i diam. without the tegument, 

 spherical, bright aeruginous, 7-8 ,u diam. with tegument, homo- 

 geneous; tegument hyaline, homogeneous, tlu; younger tegu- 

 ments more dense than the oldc^r. 



GroAving in close association with certain species of filamen- 

 tous Myxopliyceae on limestone near Hato Arriba, Arecibo, no. 

 1406 a, type, and no. 1397 a. 



The collection oi 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, but 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 24 



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 \i 

 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. 55 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 difficult to state the distinguishing characteris- 

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

 the material of no. 55 a, which 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 



