EXPLANATION OF PLATE III 

 Phycomycetes 



Fig. I. Sj'?u/i}>trmm mercuria/is {CnYTRiDiAi-Es). Producing a large 

 gall on the epidermis of Mej-curialis pereti7iis. The resting spore appears 

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



Fig. 2. Synchytruim inyosotidis (Chytridiales). Producing a 

 smaller gall in a single epidennal cell of Myosotis 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 h}^ha of the fungus appears on the lower 

 side of the cell and is shaded. 



Fig. 4. ^^;-wzf?j/(?ra (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 Bar}-.) 



Fig. 7. Emptisa (Entomophthorales) on the larva of clover-weevil 

 [Phytono7?nis) which has crawled to the tip of a blade of grass to die. X 

 5 . ( Redrawn from Arthur. ) 



(230) 



