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DESCRIPTION OF THE PLATES. 
Aerial conidiophore with microconidia in heads (Cephalosporium type). 
x 730. 
Types of microconidia from a single culture on nutrient agar 3 days old 
x 730. 
Formation of microconidia. 
Germination of the microconidia. x 730. 
Fusarium stage (macroconidia) with mode of attachment. The lower 
four spores were formed from the microconidia figured in fig. 6. x 730. 
From a continuous observation. x 730. 
Chlamydospores. x 730. 
Germination of the macroconidia with formation of secondary spores. 
From an old maltose culture. x 330. 
Anastomosis between the germ tubes of two macroconidia. x 330, 
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PLATE V. 
Early stage of root infection in pigeon-pea wilt. The seedling was sown 
in infective soil on November 21st, 1907, and was removed on March 
28th, 1908. Eight seedlings had wilted between January and 
March. x 1}. 
Stages in pigeon-pea wilt. From a photograph. 
Puate VI. 
Two of the pots of Series XV. One inoculated with Fusarium udum n. 
sp. and one not inoculated (see text). From a photograph. 
Three of the pots of Series XIV, two inoculated with Fusarium udum 
n. sp. and one not inoculated (see text). From a photograph. 
