Parasitism of pythium debaryanum hesse on the potato tuber 415

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Description: English: PLATE 37 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 Photographs enlarged from portions of a motion photomicrograph, showing the method of cell wall penetration by Pythium hyphae. A. — Shows the hypha growing against the potato cell wall. Sufficient pressure has already been applied to cause the hypha to bend. Notice that this bending increases in later photographs. B. — A little later stage than A. C. — The tip has broken through as a small tube D. — Penetration is complete. Notice the constriction of the hypha at the point where it penetrates the potato cell 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.