1912] BARRETT— BLASTOCLADIA 371 



Fig. 34. — Stained zoospore from a ripe zoosporangium : nuclei very 

 net; iron-alum hematoxylin. 



X 



FlG - 35- — Binucleate zoospores. 

 Fig. 36. — Zoospore preparing for germination: the large reserve food 

 body is broken up into small granules. 



F JG - 37- — Uninucleate germinating zoospores. 



Fig. 38. — Germinating zoospore showing the large nucleus just previous 

 to division. 



Fig. 39. — Binucleate stage of a germinating zoospore. 



Fig. 40.— More advanced condition of 



Fig. 41. — Zoospore killed with iodine: nucleus clearly shown, but the 



zoospore 



food body is invisible. 



Fig. 42. 



Flemming's solution: granules sur- 



rounding the nucleus and reserve food body stained black. 



Fig. 43.— Resting nucleus, showing a large deeply staining chromatin 

 mass surrounded by faintly staining cytoplasm. 



Fig. 44. — Late stage in the division of a nucleus. 



Figs. 45-55. — Various stages of nuclear division. 



Fig. 56. — A photomicrograph of zoosporangia discharging zoospores, and 

 resting sporangia. 



Fig. 57.— A photomicrograph of the plant from which fig. 56 was taken. 

 Fig. 58. — A photomicrograph of a small entire plant. 

 Fig. 59.— A photomicrograph of a young plant grown on agar, which 

 shows the arrangement of zoosporangia in chains. 



