. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 265. asci subclavate, fugaceous, 55-70 fi; ascospores allantoic!, 12- 22 X 3-5 yn; conidial stage ( = Gloeosporium rufomaculans) with small sori, developing in more or less concentric circles, usually soon rupturing and pushing out spores in small pinkish masses; spores hyaline to greenish, chiefly oblong, unicellular 10- 28 X M- The conidial stage of this fungus was first described by Rev. M. J. Berkeley in 1854 as a Septoria. It was later transferred to the form genus Gloeosporium under w
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 265. asci subclavate, fugaceous, 55-70 fi; ascospores allantoic!, 12- 22 X 3-5 yn; conidial stage ( = Gloeosporium rufomaculans) with small sori, developing in more or less concentric circles, usually soon rupturing and pushing out spores in small pinkish masses; spores hyaline to greenish, chiefly oblong, unicellular 10- 28 X M- The conidial stage of this fungus was first described by Rev. M. J. Berkeley in 1854 as a Septoria. It was later transferred to the form genus Gloeosporium under which name the literature pertaining F'g. 193.â?. perithecium of G. rufomacu- ... 1 c l^ns showing asci in aitu; 6, asci show- to it IS largely to be found. ing detail. After Spaulding and von See The as- ^'^^'^''^â cigerous stage was found by Clinton "''^ in 1902 and the fungus described as a Gnomoniopsis. In 1903, it was given the present name. A bibliography of some one hundred eighty titles is given by Spaulding and von '*' The conidia germinating on apples send germ tubes through the skin, usually through wounds, occasionally through a sound ^' The mycelium grows subepidermally, branching rapidly, intercellularly and intracellularly, absorbing the sugar and other nutrients present, and resulting in brown discolora- tion of cells and dissolution of their connec- tion with neighboring cells. The mycehum is first hyaline but later, especially in the stromata, it may be quite dark. Acervuli Appressoria produced appear, often in concentric rings, lift- by germinating spores. ^'f i o > Aiter Spaulding and ing the epidermis with their palisades of conidiophores. The latter, at first hyaline, later olivaceous, bear the numerous conidia, which are pinkish, rarely cream-colored, in mass. In germination the conidia be- come uniseptate and often on the tips of the young mycelium develop the dark thick-walled irregularly shaped spore-like struc
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
