. The fungi which cause plant disease . Plant diseases; Fungi. 148 THE FUNGI WHICH CAUSE PLANT DISEASE. Fig. 104.—P. trifolii. Ascus and paraph- yses; germinating spores. After Ches- ter. spores hyaline, 10-14 fi long; paraphyses numerous, filiform. A Phyllosticta thought to be its conidial stage has been reported.*' On dead spots in leaves of alfalfa and black medick. P. trifolii (Bernh.) Fcl. This is closely related to, perhaps identical with, the last species. Sporonema (Sphaeronaema) phacidioides Desm. is supposed to be its conidial form. This co- nidial stage has not however, been observe
. The fungi which cause plant disease . Plant diseases; Fungi. 148 THE FUNGI WHICH CAUSE PLANT DISEASE. Fig. 104.—P. trifolii. Ascus and paraph- yses; germinating spores. After Ches- ter. spores hyaline, 10-14 fi long; paraphyses numerous, filiform. A Phyllosticta thought to be its conidial stage has been reported.*' On dead spots in leaves of alfalfa and black medick. P. trifolii (Bernh.) Fcl. This is closely related to, perhaps identical with, the last species. Sporonema (Sphaeronaema) phacidioides Desm. is supposed to be its conidial form. This co- nidial stage has not however, been observed on alfalfa. Ascocarps mostly epiphyl- lous, on dead spots, averaging mm. broad, yellowish or brownish; spores elliptic 10- 14 X 5-6 IX. Conidia in cup-shaped pyc- nidia which are numerous, small, light brown; disk cinnamon- colored; conidia ovoid-oblong, 5 |i, bi-guttulate. P. tracheiphila Miiller-Thurgau ^^ is found upon the grape in Europe. P. salicis (Tul.) Pot. occurs on Salix. Conidia (=Glceosporium saUcis). P. ribis, ;-" Apothecia appear in the spring on dead leaves of the previous season; saucer-shaped, fleshy, somewhat stalked; asci clavate, spores hyaline, ovoid; paraphyses simple or branched, slightly clavate, rarely septate. Conidial phase (=Glceosporium ribis) on the leaves of the host forming an abundant amphigenous infection; acer- vuli stromatic; conidiospores commonly 19 X 7 M, varying from 12-24 x 5-9 /i, escaping in gelatinous masses. On red and white currants less com- monly on black currants and gooseberries both in Europe and America. The ascigerous stage of this fungus was demonstrated by Klebahn " in 1906 to be genetically connected with what had been. 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
