PLATE XLIV 



Rheosporangium aphanidermatus: 



Fig. I. — Cleavage of the sporangium into zoospores within the wall of the prespo- 

 rangium. Xa.ooo. 



Figs. 2, 3, 4, 5, 8, 9, II. — Nuclear divisions in the mycelium. Fig. g, Xa.ooo; others, 



X3.000- 



Fig. 6. — Portion of presporangium showing rupture at tip and the initial stage of 

 sporangium egress. X 2,000. See also figure 10. 



Fig. 7. — Maturing presporangium. X250. 



Fig. 10. — Later stage of sporangium egress from a branch of the presporangium. 

 X2,ooo. See also figure 6. 



Fig. 12. — Vegetative mycelium; living. X500. 



Fig. 13. — Section of nearly mature presporangium, showing development of large 

 vacuoles. X2,ooo. See also Plate XLVIII, figure i. 



(292) 



