Fungous diseases of plants . Fig. 99. iVeocosmospora vasinfecta. {c after Erw. F. Smith)fl, the fungus in xylem of stem; b and <-, conidial stages from cultures and hence through the root system. This is believed to be thesole method of infection with the form on cotton and is also believed that healthy plants are directly affected with-out the assistance of any other organism or mechanical effectcausing an injury through which the fungus might obtain mycelium of the plant is at first found most abundantly inthe vessels of the xylem (Fig. 99, a) ; but in later stages of
Fungous diseases of plants . Fig. 99. iVeocosmospora vasinfecta. {c after Erw. F. Smith)fl, the fungus in xylem of stem; b and <-, conidial stages from cultures and hence through the root system. This is believed to be thesole method of infection with the form on cotton and is also believed that healthy plants are directly affected with-out the assistance of any other organism or mechanical effectcausing an injury through which the fungus might obtain mycelium of the plant is at first found most abundantly inthe vessels of the xylem (Fig. 99, a) ; but in later stages of thedisease it may pervade other tissues. Upon the death of theplant it comes to the surface along the lines of least resistance ;hence it appears lineally distributed in the areas between thevertical lines of bast. The fungous hyphae are, as they occurin the host plant, yellowish in color, considerably septate, andirregularly branched. According to Atkinson conidia may be 238 FUNGOUS DISEASES OF PLANTS
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