28 MEMOIRS OF THE KEW YORK BOTANICAL GARDEN 



cell in the colony, and in neither is there such a definite membra- 

 naceons wall separating the protoplasts. Another method of re- 

 production would have to be added to the Charaaesiphonaceous 

 genus Pleurocapsa in addition to its schizogenous method of pro- 

 ducing gonidia, and likewise the Chroococcaceous genus Chroo- 

 coccus would have to be emended to incluude such forms produc- 

 ing specialized resting cells. It resembles the typical species in 

 the genus Anacystis in having a definite life cycle, at the end of 

 which all of the cells of the colony are simultaneously changed 

 into resting spores, the so-called rejuvenescent period. It dif- 

 fers from Anacystis in that the cell walls are membranaceous 

 and adhere by their entire surface until maturity, instead of be- 

 ing cartilaginous, mucilaginous, or gelatinous, as in Anacystis, 

 such walls expanding more or less and permitting the proto- 

 plasts to migrate from each other to variable and considerable 

 distances. 



Endospora rubra sp. nov. 



Plate 5, figure 51 



Colonies variable in size, more or less cuboidal, with rounded 

 corners, containing 8-32 cells, rarely 64 cells; cells pale aeru- 

 ginous, more or less obscured by the pinkish or coral-red cell 

 walls, at maturity angular ; resting spores 8.5-9.5 m diam. 



Growing on lava rock among other Myxophyceae at Coamo 

 Springs, no. 1916 a, type, and nos. 1012 a and 1923 a ; on rocks 

 near Laguna Joyuda, Mayagiiez, no. 1209 h and 1301 a ; on old 

 wood by Hot Springs, Coamo Springs, no. 405 ; north of Maya- 

 giiez, no. 1000 e. 



Endospora mellea sp. nov. 



Colonies variable in size, more or less cuboidal with rounded 

 corners, containing 4-16 cells, rarely more; yellowisli or honey- 

 colored, closely crowded together; resting spores with thin yel- 

 lowish walls, 6.5-8 M diam., decidedly angular. 



GroAving on rock about ten kilometers north of Utuado, no. 

 1533 a, type; on rocks in Jayuya, no 1770 d; on limestone at 

 Guanica, no. 1840 a. 



Endospora bicoccus sp. nov. 

 Pirate 5, figure 52 



Cells existing singly or in pairs, very rarely in fours, free 

 among other algae, not forming a stratum; single cells irregular 



