. Endothia parasitica and related species . th, nearly smooth on thesurface. The superficial mycelium was pale orange yellow. The pale yellow-ocher spore masses were minute, very numerous, and nearly covered the sur-face. The medium was slightly greenish about the sides of the flask justbeneath the mycelium. DISTINGUISHING CHARACTERS OF THE VARIOUS SPECIES ON CORN MEAL IN FLASKS. The color reactions of the various species on corn meal are verystriking. Endothia fiuens (PI. XXI, fig. lb), as noted above,changes the whole mass of the medium to perilla purple in less thana month. E. gyrosa and E.
. Endothia parasitica and related species . th, nearly smooth on thesurface. The superficial mycelium was pale orange yellow. The pale yellow-ocher spore masses were minute, very numerous, and nearly covered the sur-face. The medium was slightly greenish about the sides of the flask justbeneath the mycelium. DISTINGUISHING CHARACTERS OF THE VARIOUS SPECIES ON CORN MEAL IN FLASKS. The color reactions of the various species on corn meal are verystriking. Endothia fiuens (PI. XXI, fig. lb), as noted above,changes the whole mass of the medium to perilla purple in less thana month. E. gyrosa and E. singularis also produce this color change,but somewhat more slowly. E. fiuens mississippiensis, E. tropicalis,and E. parasitica, on the other hand, in hundreds of cultures havewholly failed to produce any purple color. This furnishes an easyand reliable method of distinguishing E. parasitica from E. fiuens Bui. 380, U. S. Dept. of Agriculture. PLATE XVII. i s> f\ •* ;• * 1 2 3 4 5 < \ \ » i V/? w# J -67 10 •0 11 12 13 14 15. PHOTOMICROGRAPHS OF PYCNOSPORES AND ASCOSPORES OF ENDOTHIA. Figs. 1 to 6.—Pycnospores: 1, Endothiagyrosa; 2, E. sinqularis; 3, E. fluens;4, E. longirostris; 5, E. parasitica (American); 6, E. parasitica (Chinese).Figs. 7 to 15.—Ascospores: 7, E. gyrosa; 8, E. singularis; 9, Sphaeria radicalis,from SchweinitzS Specimen in Friess Herbarium; 10, Endothia pseudorad-icalis; 11, e. fluens; 12, e. fluens mississippiensis; 13, e. longirostris;14, E. tropicalis; 15, E. parasitica. Bui. 380, U. S. Dept. of Agriculture. PLATE XVIII.
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