JEHANGIR FARDUNJI DA8TUR. 195 



the zoospores move about in the sporangium or make any effort to 

 escape 1 (Plate IV, Fig. 4). 



2. The papilla swells or is blown into a hemisphere by the 

 inrush of the zoospores (Plate IV, Figs. 1 and 2). It disappears 

 before all the zoospores have left the sporangium (Plate IV, Fig. 3). 

 Those that get into it remain stationary, huddled together for 

 a few seconds, before dashing away. The swollen papilla can 

 be distinctly seen by treating a discharging sporangium with 

 iodine. This mode of discharge has been observed in Pythium 

 palmivorum.* 



The zoospore escapes from the sporangium by contracting its 

 anterior end and squeezing it through the opening ; it then swells 

 up, the zoospore becoming dumb-bell shaped. Then the posterior 

 end contracts and passes to the outside. Its vacuole either 

 disappears and re-appears as soon as the anterior end of the 

 zoospore is out of the sporangium, or divides into two, one 

 half going to the front portion and the other to the hinder and 

 both re-uniting when the zoospore is completely out of the 

 sporangium, or along with the contraction of the zoospore the 

 vacuole also contracts, looking like an hour-glass, when the 

 zoospore is partly out of the sporangium. Each zoospore as it 

 makes its escape from the sporangium generally drags out the one 

 behind it. It is not always that the zoospores succeed in getting 

 out of the sporangium. Those that do not find their way out, 

 round themselves off and may germinate in situ? Zoospores in 

 a sporangium which for any reason get separated from those that 

 are escaping from it, find it difficult, and frequently altogether fail, 

 to get out. 



The zoospores, as a rule, escape as distinctly defined units but 

 occasionally in clumps of several united together, moving about 

 by amoeboid movements before getting separated from each other. 



1 C.f. Hartig, II. lor. cit., p. 44. 



2 C.f. Butler, E. J. Bud-rot of Palms in India. .Mem. Dept. Agric. India, Bot, Ser. Ill, 

 No. 4, 1910, p. 254. 



3 C.f. Hartig, R. he, n't. Coleman, L. C, he ril., p. 62, 



