38 HENRIK PRINTZ [1920 



Explanation of Piates. 

 PI. I. 



Fig. 1 — 17. Protococcus consoclatus nov. spec, 



Cells formiiig larger and smaller colonies. 



Fig. 18 — 30. Protococcus verrucosus nov. spec. 



Fig. 31—51. Chlorococcum vitiosum nov. spec. 



Fig. 31 — 43, ordiinary vegetative oells, of wliich fig. 

 41 and 42 have somewhat crenulate membranes; 38 

 has the memhrane only partly crenulate. Fig. 44, 45, 

 and 48 ,sho\v sporangies, 46, 47, 49, 50, and 51, eniptied 

 sporangies or sporangies emptying Ihemselves. 



Fig. 52 — 78. Phaseolaria obliqua nov. gen. et spec. 



Fig. 52 — 66 show ordinary vegetative cells; fig. 52 

 and 57 showing oells seen from above and from the 

 side. Fig. 67—74, oells in zoospore-formation. Fig. 71 

 and 73, oells with crenulate membranes. Fig. 75 — 77, 

 emptied zoosporairgia. Fig. 78 is a pile of oells of 

 Phaseolaria obliqua. The conlenls are drawn in one 

 cell only, forming zoospores. 



PI. II. 



Fig. 79 — 89. Acanthococcus granulatus Reinsch var. aerophilus 

 nov. var. 



Fig. 84, 85, 82, 83, and 79, various advanoing stages 

 of reproduction, Fig. 81, 82 are emptieid mother mem- 

 branes. Fig. 87 — 89, very young speoiuTens; Ihe smal- 

 lest ones measure only about 3,5 // in diameter. Fig. 

 86, specimen with extraordinary low, roundied mem- 

 brane-warts. 



Fig. 90—104. Chlorella vulgaris Beyerinck. 



Fig. 93, mother membrane with two a pianospor es. 

 Fig. 90 and 91, aplanospores escaping the molher 

 membrane. Fig. 92, 94, and 95, cell-piles where the 

 cells on account of the mutual compression are some- 

 what flattened on one or more sides. The memljiranes 

 are sometimes partly crenulate. Fig. 96 — 104, solitary 



