. The fungi which cause plant disease . Plant diseases; Fungi. 210 THE FUNGI WHICH CAUSE PLANT DISEASE Dothichloe Atkinson (p. 199)"' Stroma thin, hard when dry, black, especially the outer portion, lighter within, effuse, pulvinate, disciform or armilla-form, partly or entirely surrounding the host; perithecia crowded, confluent with the stroma, but the thin walls of distinctive structure, im- mersed, the apex projecting; asci cylindric, 8-spored; spores fih- form, septate at maturity, and eventually separating at the septa into short seg- ments. Likfe the preceding genus, both species D
. The fungi which cause plant disease . Plant diseases; Fungi. 210 THE FUNGI WHICH CAUSE PLANT DISEASE Dothichloe Atkinson (p. 199)"' Stroma thin, hard when dry, black, especially the outer portion, lighter within, effuse, pulvinate, disciform or armilla-form, partly or entirely surrounding the host; perithecia crowded, confluent with the stroma, but the thin walls of distinctive structure, im- mersed, the apex projecting; asci cylindric, 8-spored; spores fih- form, septate at maturity, and eventually separating at the septa into short seg- ments. Likfe the preceding genus, both species D. atramentosa (B. & C.) Atk. and D. aristidse Atk. are grass inhabitors of warm regions of the United States. The former is the commoner species with a wider range of hosts. Epichloe (Fries) Tul. (p. 199) Stroma effused, subfleshy, at first pale, becoming bright orange, sheathing the host; perithecia immersed or with the ostiola protruding; asci cylindric, 8- spored; spores filiform, many-celled. Of some nine species only one is important. E. typhina (Pers.) Tul. Stroma ef- fused, at first pale, becoming bright orange, forming sheaths 2-5 cm. long Fig. 151.—Epichloe. A, habit around stems of varfous grasses, often section^'c, 'McusTi>,"asc^ destroying the inflorescence; perithecia feld and1indar°*^'' ^"^ ^^^^^ Scattered, partially or entirely im- mersed in the stroma, soft, membranous, concolorous with the stroma, the ostiole rather prominent; asci very long; spores almost as long as the ascus, closely fasciculate, multiseptate, about 2 ^ in diameter; conidia elliptic, hyaline, 4-5 X 3 II, preceding the perithecia on the stroma. Many grasses are affected, often to serious extent. The mycelium shows first as a yellowish cobwebby growth surrounding the leaf sheath and soon develops a conidial stroma. Later the stroma. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
