. The fungi which cause plant disease . Plant diseases; Fungi. 202 THE FUNGI WHXH CAUSE PLANT DISEASE The majority of economic species belong to the first subgenus. Eunectria (p. 201) N. cinnabarina (Tode) Fr. Stroma erumpent, tubercular, at first pinkish or yellowish-red, darker with age, 1-2 mm. high and broad; perithecia almost glo- bose, the ostiole rather prominent, becoming slightly collapsed, at first bright cinnabar-red, darker with age, granular, 375-400 fi in diameter; asci clavate, 50-90 x 7-12 n; spores mostly 2-seriate, elliptic elongate, ends obtuse, slightly curved, 12-20 x 4r-6
. The fungi which cause plant disease . Plant diseases; Fungi. 202 THE FUNGI WHXH CAUSE PLANT DISEASE The majority of economic species belong to the first subgenus. Eunectria (p. 201) N. cinnabarina (Tode) Fr. Stroma erumpent, tubercular, at first pinkish or yellowish-red, darker with age, 1-2 mm. high and broad; perithecia almost glo- bose, the ostiole rather prominent, becoming slightly collapsed, at first bright cinnabar-red, darker with age, granular, 375-400 fi in diameter; asci clavate, 50-90 x 7-12 n; spores mostly 2-seriate, elliptic elongate, ends obtuse, slightly curved, 12-20 x 4r-6 /x; paraphyses delicate. Tubercularia vulgaris borne on the stroma is the conidial stage. Conidiophores aggregated into tu- bercular masses each 50-100 it long; conidia on short lateral branches, elliptic, hyaline, 4-6 x 2 /t. The closely septate delicate hyphae grow rapidly through the wood or bark, penetrating nearly Fig. 14a.—N. cinnabarina, perithe- every ccU and turning the wood cia in stroma, ascospores issuing in -i , i j n a* j. r x cirri; germinating spores. After black and Coliectmg to lorm Stro- ^"^e- mata on or in the bark. These stromata in fall or spring break through the epidermis and produce warty, gray to pink, excrescences, which at first bear profuse conidia both terminally and laterally on short stalks and later dark-red ascigerous structures; though the latter are much less common and are often absent. The fimgus is said to be unable to affect living cambium and cortex. It is foimd saprophytically on many decayed woody plants that have been frost killed, and parasitically on pear, Tilia, .^culus, China berry, Betula, Ribes, Acer, Carya, Morus, Prunus, Quercus, Ulmus, etc. Mayer ^^ germinated spores on a cut branch; the myceUum spread to and killed the main stem; tubercles appeared and during the following year perithecia developed on these tubercles. In America the species has attracted attention on the currant '^'' '^ in which host the mycelium inv
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
