. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. 'f-B Fig. s.—^Free cell formation of spores in the ascus of Erysiphe communis. A, ascus with single nucleus; C, cytoplasm; N, nucleus; NL, nucleolus; 5, successive stages in nuclear division within the ascus; at X, early anaphase, nuclear membrane, NM, still persisting: -Ri kinoplasmic radiations from the poles; at Y, telophase, new nuclear membrane not yet formed; Z, a later stage where the nuclear membranes demark the daughter nuclei; C, A, B and C, axe successiv
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. 'f-B Fig. s.—^Free cell formation of spores in the ascus of Erysiphe communis. A, ascus with single nucleus; C, cytoplasm; N, nucleus; NL, nucleolus; 5, successive stages in nuclear division within the ascus; at X, early anaphase, nuclear membrane, NM, still persisting: -Ri kinoplasmic radiations from the poles; at Y, telophase, new nuclear membrane not yet formed; Z, a later stage where the nuclear membranes demark the daughter nuclei; C, A, B and C, axe successively later stages than Z in B. At A some of the kinoplasmic radiations are bending downward about the nucleus N; at B the nucleus is nearly enclosed; and at C entirely enclosed by the radiations, which now form a complete membrane cutting off a portion of the cytoplasm of the ascus, and thus forming a complete cell. (Arranged after drawings by Harper. B and C are diagrammatic. For the sake of simplicity of description, various stages of nuclear division are shown in a single ascus, although at any given time only one stage would actually be present.) have previously been formed. This process of wall formation reminds one of gradual closing in from all sides of an iris diaphragm. In yeasts and some other fungi cell division is preceded by budding. The mother cell puts forth an outgrowth like itself in general form; the nucleus divides and one of the daughter nuclei enters the bud; and a division wall is then formed sepa- rating the bud from the parent cell (Fig. 6).. 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, William Chase, 1861-. Philadelphia, P. Blakiston's Son
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantanatomy, bookyea
