Fungi, Ascomycetes, Ustilaginales, Uredinales . Fij,. 181. Puccinia Podophylli S.;fertile cell of teleutosorus givingrisetoteleutospores; after Christ-man. Fig. 182. Pliraamidiitm violaceum Went.; a. teleuto-spores, x 1080; />. fusion of nuclei in teleutospore,x 1520; after Blackman. It may be hazarded that in the Uredinales the similarity of the physio-logical history of the nuclei before they become associated is responsiblefor a minimum of attraction between them, so that there is no sufficientlystrong impulse towards fusion till meiosis is about to take place ; being,however, in the sam
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Fungi, Ascomycetes, Ustilaginales, Uredinales . Fij, . 181. Puccinia Podophylli S.;fertile cell of teleutosorus givingrisetoteleutospores; after Christ-man. Fig. 182. Pliraamidiitm violaceum Went.; a. teleuto-spores, x 1080; />. fusion of nuclei in teleutospore, x 1520; after Blackman. It may be hazarded that in the Uredinales the similarity of the physio-logical history of the nuclei before they become associated is responsiblefor a minimum of attraction between them, so that there is no sufficientlystrong impulse towards fusion till meiosis is about to take place ; being, however, in the same cell, they have no opportunity of dissolving partnershipand the influences which bring about meiosis affect both alike. A considerable similarity exists in the arrangement of the differentgroups of sporogenous cells. The uredo- and teleutosori are clearly com-parable, both are of indefinite extent, with or without a border of paraphyses, and both consist of groups of rectangular basal cells from which the sporemother-cells arise in horizontal