. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 231 Perithecia were found by Viala»" and by Prillieux»" on old wood, long dead from such attack. These belong to the genus Rosellinia and are believed to present the ascigerous form of Dema- tophora necatrix. Similar claims of relationship of this fungus to several other genera have been made and its actual position cannot be consid- ered as established with certainty. R. massinkii Sacc. Perithecia sparse, globose or depressed, carbonous, 165 fi; asci cyhndric, 54 x 8 At; spores dark-br
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 231 Perithecia were found by Viala»" and by Prillieux»" on old wood, long dead from such attack. These belong to the genus Rosellinia and are believed to present the ascigerous form of Dema- tophora necatrix. Similar claims of relationship of this fungus to several other genera have been made and its actual position cannot be consid- ered as established with certainty. R. massinkii Sacc. Perithecia sparse, globose or depressed, carbonous, 165 fi; asci cyhndric, 54 x 8 At; spores dark-brown, el- liptic, 1-rowed, 10 x 5 jti. It is reported by Halsted on hyacinth bulbs. R. bothrina B. & Br. is the cause of a tea root disease. Pseudodematophora closely allied to the above forms is described by Beh- rens "'^ on diseased grape roots. R. quercina Hart, is ^'o- l^S-—^- necatrix. 4, coremium and co- nidia; S, perithecia extruding spores; 6, asci parasitic on roots and stems and paraphyses. After Harijg, Prillieux and of young oaks, producing a *' Rhizoctonia-like mycelium, at first white, later brown. Perithecia are usually abimdant. Black sclerotia the size of a pin head are also present superficially. R. radiciperda Mas. closely allied to R. necatrix, affects a large number of hosts, among them apple, pear, peach, cabbage, and potato. An undetermined species of this genus is said to cause a cran- berry disease.'^^ Shear, however, in his extensive studies of cran- berry diseases, did not find it. R. aquila (Fr.) d. Not. injures Morus. Its conidial form is. 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
