OOMYCETES 



65 



-piQ, 39. — Saprolegnieae. Degeneration of diplanetic zoospores. 1. Achlya racemosa. 

 Sporangiferous hyphae. Both upper sporangia are empty while the lower contains zoo- 

 spores already surrounded by a membrane (Reticulate sporangium). 2. Dictyuchus mono- 

 sporus. Two superimposed zoosporangia, with reticulate structure, the upper empty, the 

 lower just mature. 3. Exit of zoospore from zoosporangium. 4. Zoospore surrounded by 

 membrane. 5. Resting zoospore has just slipped out of membrane. 6. T hraustotheca 

 clavata. Liberation of sporangiospore balls. 7. Exit of zoospore from sporangiospore. 

 8. Aplanes Braunii. Sporangium with internally germinating zoospores. 9. Germination 

 of zoospores before zoosporangium, 10 hours after their exit. (1 X 55, 2 X 370; 3 to 7 X 

 930; 8 X 33; 9 X 280; after Pringsheim, Weston, Bary and Maurizio.) 



