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ABSTRACT
Hyphae of Elsinoë panici Tiffany and Mathre penetrated between epidermal cells of Panicum virgatum L. and quickly formed stromata composed of darkly pigmented, firm, pseudoparenchymatous cells. Intercellular hyphae crushed and replaced host cells. Hyphae became intracellular only in epidermal, mesophyll, and colorless cells. Hyphae did not penetrate bundle sheath cells or invade vascular bundles. Cells adjacent to infected cells remained intact.
Subepidermal acervuli, lined with an unorganized layer of conidiogenous cells, developed in stromata soon after epidermal colonization and opened by an irregular tear. Conidia (Sphaceloma) formed in a mucous matrix. Ascostromata developed infrequently. They were supracuticular, irregularly multiloculate with uniascal locules, and softer and more loosely structured than stromata. Structures resembling spermagonia with spermatia formed in young ascostromata. The function of these cells was not observed. Young asci were hooked, suggesting development from a crozier apparatus. Ascospores had 1, 2, or 3 transverse septa, rarely becoming longitudinally septate.