NEW MYXOPHYCEAE FROM PORTO RICO 



25 



hlabe, but there is not the continuous colonial tegument, except 

 in part where the colonies are old, characteristic of that species. 



Anacystis minutissima sp. nov. 



Plate 5, figure 46 



Colonies spherical to somewhat irregular in outline, ir)-25 \i 

 (up to 45 m) diam.; cells densely ci'owded together, 0.8-1.2 |j 

 diam., pale aeruginous, often tinged with yellow; tegument thin, 

 homogeneous, close-fitting, hyaline. 



Growing in association with other Myxophyceae among moss 

 on a water pipe near a stream, Maricao, no. 1194 a, type ; on tree 

 trunks, Coamo Springs, no. 300 ; on a wall at a bridge in Ca- 

 guas, no. 462 \ on broken rock about seven kilometers east of 

 Coamo, no. 1869 e ; on a wall at Hot Springs, no. 402 h ; in the 

 overflow from a hot opening, Coamo Springs, no. 402 h; on a 

 brick wall near Juan Martin, Fajardo, 7to. 732 a ; in the overflow 

 from a hot spring, Coamo Springs, no. 367 e. 



The specimens of this species of Anacystis are almost per- 

 fect spheres when young, and for the most part retain the 

 shape to maturity. Apparently the resting spores merely de- 

 velop a very thin, smooth wall at maturity. The species seems 

 closely related to A. firma (Breb. & Lenorm.) Sehmidle, but does 

 not form the firm, mucous stratum characteristic of that species. 

 There is also much less variation in the size of the cells. 



Anacystis consociata sp. nov. 

 Plate 5, figure 47 



Colonies spherical, quite firm, 25-50 n diam. ; cells spherical 

 to somewhat irregular, bright bluish green, homogeneous, 2.8- 

 3.4 n diam., closely associated, leaving a distinct margin of tegu- 

 ment on the surface ; resting spores with thin, hyaline, smooth 

 walls ; tegument homogeneous throughout the colony, hyaline, 

 smooth. 



Growing in association with other species of Myxophyceae. 

 Yerj widely distributed. The following are a few of the locali- 

 ties noted : on a wooden fence near Santurce, no. 2 c, type ; on a 

 wall. Hotel Nava, Santurce, no. 56 j ; Coamo Springs, nos. 300 a 

 and 1901 c; on tree trunks, Fajardo, no. 656; on a church Avail, 

 Sabana Grande, no. 961 d ; on a garden wall. Hotel Paris, Maya- 



