PLATE LXXXI 
Cercospora beticola Sacc: 
Fig. i.—Conidia germinating on a sugar-beet leaf, with germ tubes entering open 
stomata. A, a, conidium; b, germ tube. B, a, conidium; b, b, two germ tubes pene¬ 
trating two stomata. C, c, host mycelium below stoma in air chamber and forming a 
haustorium against a palisade parenchyma cell (d) represented with their chloroplasts 
by dotted lines. D, c, host mycelium in air chamber; d , parenchyma cells; e> exit of 
conidiophores. E, c, host mycelium; d, parenchyma cells;/, heavily staining host 
substance probably secreted for isolation purposes. F, a , conidium; b, germ tube; 
c, host mycelium in guard cell and epidermal cell. G, c , host mycelium or sclerotium; 
d, collapsed parenchyma cells; e t conidiophores; /, heavily staining host substance. 
(Camera-lucida drawings.) 
