. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. igo HEMIBASIDIOMYCETES [ Federley, in 1903, described specimens of this fungus in which conjugation is followed not only by the migration of the nucleus of one of the cells concerned, but also by nuclear fusion (fig. 15s). In view of the fusion in the young spore recorded by Dangeard and by Rawitscher the details of de- velopment in this species de- mand further investigation. Ustilago Maydis, the smut of Zea Mays, induces con- siderable hypertrophy. The deformations contain a mass of gelatinous mycelium from which brand-spores are pr
. Fungi, ascomycetes, ustilaginales, uredinales. Fungi. igo HEMIBASIDIOMYCETES [ Federley, in 1903, described specimens of this fungus in which conjugation is followed not only by the migration of the nucleus of one of the cells concerned, but also by nuclear fusion (fig. 15s). In view of the fusion in the young spore recorded by Dangeard and by Rawitscher the details of de- velopment in this species de- mand further investigation. Ustilago Maydis, the smut of Zea Mays, induces con- siderable hypertrophy. The deformations contain a mass of gelatinous mycelium from which brand-spores are produced. When mature, the spore mass gauses the rupture of the enclosing tissues, and the spores escape. They germinate to produce basidia from which uninucleate basidiospores are abstricted. These in turn multiply by budding, but, accord- ing to Rawitscher, they never conjugate, nor do they form a definite mycelium (fig. i56«). In the infection of the host plant, hyphae are for the first time developed, and, unlike those of most investigated smuts, consist of uninu- cleate cells (fig. 156 b). This is the case even when the hyphae begin to break up in preparation for spore-formation. At this stage, however, the ends of adjacent cells are seen to become swollen where they are in contact, the wall separating their protoplasm breaks down, the two nuclei come together in Fig. 155. Ustilas^o Tragopogonis pratensis {¥trs.) ^\n\.. conjugation and nuclear fusion; after 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 Gwynne-Vaughan, Helen Charlotte Isabella (Fraser) Dame, 1879-. Cambridge [Eng] University Press
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfungi, bookyear1922
