. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 229 Acanthostigma de Notarjs (p. 226) Perithecia free, globose or ovate, very small; walls leathery, black, beset with stiff bristles, ostiole short; asci usually cylindric, rarely ovate, 8-spored; spores spindle-shaped, multicellular by cross walls, hyaline; paraphyses few or none. There are some thirty species, mostly saprophytes. A. parasiticum (Hart.) Sacc.'*'"''* Perithecia globose, minute, with rigid divergent hairs, mm. in diameter; asci 50 n long, early disappearing; spores
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 229 Acanthostigma de Notarjs (p. 226) Perithecia free, globose or ovate, very small; walls leathery, black, beset with stiff bristles, ostiole short; asci usually cylindric, rarely ovate, 8-spored; spores spindle-shaped, multicellular by cross walls, hyaline; paraphyses few or none. There are some thirty species, mostly saprophytes. A. parasiticum (Hart.) Sacc.'*'"''* Perithecia globose, minute, with rigid divergent hairs, mm. in diameter; asci 50 n long, early disappearing; spores fusoid, straight or curved, smoky, 15-20 /x, continuous or 2 to 3-septate. Common on leaves of Abies, Tsuga and other conifers in Europe and America. The hyaline mycelium grows on the lower sides of branches and onto the leaves killmg them and matting them to the branches. The mycelial cushions later turn brownish and eventually very small perithecia form on Fig. 163.—Perithecium of A. Tri- chosphseria parasiticum, show- ing ostiole, bristles, asci, para- physes and spores. After Hartig. Herpotrichia Fuckel (p. 226) Perithecia superficial, globose or subglobose, texture firm, coriaceous to subcarbonous, hairy or smooth, ostiole papillate or not; asci oblong to clavate; spores fusiform, 2 or many-celled, hyaline or brown; paraphyses none. The species, numbering about twenty-five and growing on woody plants, are mostly saprophytes. H. nigra Hart.'*^ Mycelium dark-brown, widely spreading, haustoria slender, lighter in color; perithecia globose, dark, mm. in diameter; asci elongate, 76-100 x 12 /*; spores constricted, 1-3 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
