PLATE 
Helminthosporium grafnineum 
A.—Upper portion of barley plant collected near Fort Atkinson, Wis., June 25, 
1921, illustrating condition soon after death. Aa represents abortive inflorescence 
with distorted awns slightly protruding laterally from the uppermost leaf sheath. 
The leaves show longitudinal splitting into strips as well as lack of mechanical rigidity 
^evidenced by their drooping {Ah) and contorted (Ac, d) positions. Ae represents 
basal shreds of leaf, the remainder of which has broken off as result of brittle texture 
due to disease. XK- 
Ba-h.—Normal spores showing variation in size, shape, and septation. X500. 
Ca-d.—^Normal spores germinating^ in water mount, showing single germ tube 
E roduced from distal and middle segments, and i to 3 germ tubes produced from 
asal segment. X 500. 
Da-c.—Conidia from the apical segment of which has been produced a single coni- 
diophore with scars showing places of attachment of secondary conidia; also secondary 
conidia Dcahcd. Dd .—Spore with two apical secondary sporophores, one showing 
secondary spore attached. De .—Spore with two secondaty sporophores, one pro¬ 
duced from basal and one from apical segments. X500. 
Ea-e.—Group of typical sporophores emerging between distorted epidermal cells, 
showing enlargement of basal segment. X 500. 
^ All figures of conidia, germinating conidia, mycelia, conidiophores, asci, and ascospores in the plates 
accompanying this paper were drawn with the aid of a camera lucida to the same scale, and in r^roduction, 
reduced in equal proportion to give a uniform magnification of 500 diameters. Host epidermis figured in 
connection with conidiophores was drawn in surface as{>ect with the aid of the camera lucida, and the 
resulting figures redrawn as if projected at an angle of 30 degrees, yielding in reproduction a magnification 
of 500 diameters in a longitudinal direction and approximately 250 diameters in transverse direction. Fi¬ 
gures of pathological habit, of perithecia, of compound fructifications, and of test tube cultures were drawn 
at convenient magnifications, reduced in reproduction to the scales specifically indicated in the legends 
(740) 
