. Journal of Agricultural Research. mata 497 The gametophytic mycelium of Gymnoconia does not always penetrateinto every part of the leaf of, for example, the black raspberry. One-halfonly may be infected; variegations occur or angular patterns are laidout, the space between certain large veins escaping attack. Photo-graphic prints can be made directly from these leaves, either before orafter the chlorophyll has been extracted (PI. i). It will be found thatproduction of stomata on the upper side of the leaf is coincident with theinvasion of an area by the orange-rust hyphae. Plate i, C, shows
. Journal of Agricultural Research. mata 497 The gametophytic mycelium of Gymnoconia does not always penetrateinto every part of the leaf of, for example, the black raspberry. One-halfonly may be infected; variegations occur or angular patterns are laidout, the space between certain large veins escaping attack. Photo-graphic prints can be made directly from these leaves, either before orafter the chlorophyll has been extracted (PI. i). It will be found thatproduction of stomata on the upper side of the leaf is coincident with theinvasion of an area by the orange-rust hyphae. Plate i, C, shows thatthe infected area of the raspberry leaf is sharply limited on the left sideby the vein, and toward the tip on the right side the mycelium has spreadout part way between the second and third veins. There were no stomataon the dorsal side of this leaf, except over the infected areas. A some-what different pattern was worked out in the leaf shown as Plate 1, stomata occurred on the left side except at the base, into which.
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