. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 159. spreading the fungus during the summer though they have not yet actually been observed to germinate or to cause infection. Apothecia radiately arranged on the stroma which is about cm. across; asci 120-130 X 9-10 ix; spores large, 65-80 Tt m; paraphyses numerous, in- curved or hooked. Conidia (=Melasmia acerina Lev.) preceding the asci, producing numerous small, hyaline, 1-celled spores in an extended hy- menial layer. On various species of Fig. maple, apparently consist- ing o
. The fungi which cause plant disease . Plant diseases; Fungi. THE FUNGI WHICH CAUSE PLANT DISEASE 159. spreading the fungus during the summer though they have not yet actually been observed to germinate or to cause infection. Apothecia radiately arranged on the stroma which is about cm. across; asci 120-130 X 9-10 ix; spores large, 65-80 Tt m; paraphyses numerous, in- curved or hooked. Conidia (=Melasmia acerina Lev.) preceding the asci, producing numerous small, hyaline, 1-celled spores in an extended hy- menial layer. On various species of Fig. maple, apparently consist- ing of races since in different localities the host differs without a crossing over of the fungus. R. punctatum (Pers.) Fr. also occurs on maple, especially Acer pseudoplantanus. It may be distinguished from the preceding by its small, speck-like stromata. R. salicinum (Pers.) Fr. is found on willow in Europe and America. It is quite similar in external appearance to R. acerina except for the smaller average size of the spots. R. symmetiicum MflU. is another willow inhabiting species. The apothecia are amphigenous and are said to mature in autumn on the still live leaves. Other species are common especially on various Ericaceae and Coniferse in Europe and America. 113.—R. acerinum. f, conidial layer; E, ascus and paraphyses. After Tulasne. Hysteriales (p. 124) Small species with elongated, black, covered apothecia which open by a long narrow slit exposing the hymenium; asci 8-spored; spores usually long and slender. Some few are leaf parasites but most are wood saprophytes. Pycnidia are found in some species. The order serves as a bridge between the Discomycetes and the Pyrenomycetes. About four hundred 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 : Macmi
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
