Parasitism of pythium debaryanum hesse on the potato tuber 412

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Description: English: PHYSIOLOGICAL STUDY OF THE PARASITISM OF PYTHIUM DEBARYANUM HESSE ON THE POTATO TUBER by Lon A. Hawkins and Rodney B. Harvey, Journal of Agricultural Research voi. xviii, no. 5 PLATE 36 Photographs enlarged from portions of a motion photomicrograph, showing the method of cell wall penetration by Pythium hyphae. A. — Shows hypha growing toward the potato cell wall. B. — Shows hypha attached to wall and about to penetrate. C. — The tip has just broken through the wall. D. — The penetration is complete. Note the black line at the point where the hypha penetrates the wall. This may be due to a rolling up of the potato cell wall about the hypha or to a difference in refraction caused by compression of the wall. Date: 1 December 1919. Source: https://archive.org/stream/journalofagricul18unit/journalofagricul18unit Journal of agricultural research. Author: Lon A. Hawkins, Rodney b. Harvey, United States. Dept. of Agriculture; Association of American Agricultural Colleges and Experiment Stations; Association of Land-Grant Colleges and Universities; Association of Land-Grant Colleges.