PEATE 4 
A. —Basal portion of the fifth leaf of a young plant (with seven leaves) of Pueblo 
White maize, showing recently established etiolated markings due to Sclerospora 
philip pinensis which extend up from the very pale leaf sheath. Conidiophore produc¬ 
tion on this lower leaf had not as yet become abundant and conspicuous. Natural size. 
B. —Distal portion of the sixth leaf of the same plant. The etiolated areas extend 
nearly to the tip of this leaf and on them conidiophores have already developed in 
abundance, especially along the midrib. Natural size. 
C. —Portion of a leaf of Moro White maize from a plant heavily infected with 5 . 
philip pinensis. Conidiophore production is most abundant along the pallid stripes 
but also occurs scatteringly on the less conspicuously discolored areas between them 
and even on the midrib, a. Xa. 
D. —Portion of a leaf of Guam White Flint maize showing abundant production of 
the conidiophores of S. philip pinensis. X2. 
E. —Unrolled sheath of the uppermost leaf of a heavily infected plant of Moro White 
maize, showing conidiophores which were formed in the protection of this overlapping 
edge during a nocturnal storm that was so severe as to prevent spore formation on more 
exposed parts. Xi 
