EXPLANATION OF PLATE III 

 PHYCOMYCETES 



FIG. I. Synchytrium merctirialis (CHYTRIDIALES). Producing a large 

 gall on the epidermis of Mercurialis perennis. The resting spore appears 

 in the large central cell of the host. X 90. (Redrawn from Woronin. ) 



FIG. 2. Synchytrium myosotidis ( CHYTRIDIALES). Producing a 

 smaller gall in a single epidermal cell of Myosofis stricta, which encloses 

 an oval resting spore. X no. (Redrawn from Schroeter. ) 



FIG. 3. Plasmopara viticola (PERONOSPORALES). Haustoria pene- 

 trating a cell of the host ; the hypha of the fungus appears on the lower 

 side of the cell and is shaded. 



FIG. 4. Peronospora (PERONOSPORALES). Conidiophore bearing soli- 

 tary conidia issuing from a stoma on the under surface of a leaf; FIG. 5. 

 Sexual reproduction showing antherid fertilizing the egg. 



FIG. 6. Albugo Candida (PERONOSPORALES). Conidia borne in chain- 

 like rows. X 220. (Redrawn from De Bary. ) 



FIG. 7. Empusa ( ENTOMOPHTHORALES ) on the larva of clover- weevil 

 {Phytonomus} which has crawled to the tip of a blade of grass to die. X 

 5. ( Redrawn from Arthur. ) 



(230) 



