DA.AiriNC; OFF FUNGUS AM) ALLIED FOH.MS. 239" 



Explanation of Plates. 

 Plate I. Pythiiim DeBaryanum, Hesse. 



Fig. 1 . IIj'plui showino- method of branchiug and youug oogoiiia 

 (a).\700.' 



Fig. 2. Terminal oogouia, a, b, and c, progressive stages in 

 formation of oospore, o, oogoninm. p, antheridium. Xll<^'<*- 



Fig. 3. Non-terminal oogonium, with antheridium. XHOO- 



Fig. 4. Stages in formation of zoosporangium. e, empty 

 zoosporangium. X58(). 



Fig. 5. Gemnue. X8<W. 



Fig. 6. Germinating oospores. XlOOO. 



Plate II. Saprolegnia monoica, Pringsheim. 



Fig. 7. Hypha showing arrangement of protoplasm and nuclei. 

 X1500. 



Fig. 8. Young oosporangium, with nuclei. Xl-'***- 



Figs. 9 and 10. Stages in the formation of resting zoosporan- 

 gia. v, vacuoles. X'^oO. 



Fig. 11. Resting sporangium forming zoospores after quiescence. 

 X2o0. 



Figs. 12 and 13. Other resting sporangia putting forth 

 germinal tubes after quiescence. X250. 



