BY MARJORIE I. COLLINS. 



281 



cyst. Direct gennination follows this second encystment. This mode of dis- 

 charge, through cyst- tubes which penetrate the wall of the sporoeyst, is similar 

 io the mode of discharge described and figured by Lotsy for the genus Dictyn- 

 chus.^ 



Text-fig. 5. Dictyuchus type of sporoeyst incompletely discharged. 



projecting cyst tubes from empty cyst cases, (x about 170) . 



,, - Text-fig. 6. Portion of a cylindrical sporoeyst showing combination of 



■ ' Z?/r/j'i<r/zKi and W/>/ff«fi- conditions, (x 230). 



'• Text-fig.7. Composite spoi-ocyst showing predominance of ' ' Dictyit-Aplanes' ' 



C(/ndition. Mote Achlva type of branching with lateral sporocysts of 



normal Saprolcgnia form. In the latter, complete discharge has led 



to encystment and germination within the sporoeyst. (x about 170). 



The partly or wholly discharged sporocysts with their empty cyst cases and 

 projecting cyst tubes with abruptly broken tips, present a peculiar and striking 

 appearance (Text-fig. 5). In some instances there is evidence of a primary attempt 

 at discharge of the sporoeyst in the nonnal Saprolegnia manner through a terminal 

 opening (Text-fig. 5). 



§Lotsy, Pflanzensystematik, i., 1907, p. 164, fig. 95, 



