. The physiology and development of some anthracnoses ... ny chara,cters seemedto be the same. To make sure, however, that the fungus was thesame as the one on sycamore, diseased leaves were put between wirenetting and placed out of doors to winter in order to obtain the as-cigeral stage. As on the sycamorcj-the fungus spread over the deadleaf and in late winter produced perithecia in abundance. The char*acters of perithecia, asci, and spores are the same as in those producedon the sycamore, with the exception of the length of the necks of theperithecia. Outline drawings of the asci and spores
. The physiology and development of some anthracnoses ... ny chara,cters seemedto be the same. To make sure, however, that the fungus was thesame as the one on sycamore, diseased leaves were put between wirenetting and placed out of doors to winter in order to obtain the as-cigeral stage. As on the sycamorcj-the fungus spread over the deadleaf and in late winter produced perithecia in abundance. The char*acters of perithecia, asci, and spores are the same as in those producedon the sycamore, with the exception of the length of the necks of theperithecia. Outline drawings of the asci and spores are shown inf,gs. 21 and 22, so that they may be compared with those from thesycamore. The necks of the perithecia on the oak averaged much longer thanthose on the sycamore, some being as long as the body or even on the sycamore have very short necks, or ip some cases neckswere almost wanting. This single difference does not seem to meto be sufficient to separate the forms as distinct species. The length igoS] EDGERTON—AN THRA GNOSES 379. Figs. 3,-8.—Cnomonia venela. 3, Sporonema pustule on petiole of fallen sycamoreleaf; 4, perithecium in sycamore leaf; 5, Myxosporium stage on sycamore twig;6, penthecium in Quercus alba leaf; 7, acervulus from Querciis alba leaf; 8, Qitercusalba leaf, showing the perithecia, X Figs. 9, 10.—Apple, inoculated with the Gloeosporium (fiWfaWwuiwinwjjIiiijii^-«); 9, from the orange, showing hairy pustules; io, from raspberry canes. 38o BOTANICAL GAZETTE JTJNe of the neck in this genus seems to be quite variable. While Klebahnfound that the necks of Gnomonia veneta from sycamore leaves werevery short, on sterihzed leaves in the laboratory, on which he alsoproduced the perithecia, the necks were very long. I have also foundin my study of Gnomonia rubi Rehm., a form found on blackberries,that the same variation occurs. The necks in pure culture were twiceas long as those growing normally out of doors. Since this is the only di
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