File:Sexual reproduction and the organization of the nucleus in certain mildews (1905) (14784438205).jpg

Identifier: sexualreproducti00harp (find matches)
Title: Sexual reproduction and the organization of the nucleus in certain mildews
Year: 1905 (1900s)
Authors: Harper, R.A
Subjects: Mildew
Publisher: Washington, Carnegie Inst.
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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. 6o.—Chromatin strands more irregular and passing over into apparentreticulum by formation of anastomoses. Fig. 6i.—Still later, chromatin still more irregular and practically in the restingcondition. Fig. 62.—Transverse section of ascus; nucleus in spirem of second division. Fig. 63 a, b.—Later prophase of second division ; chromosomes appearing in twosections. Fig. 64.—Still later prophase, second division. Fig. 65.—Equatorial-plate stage; second division; one spindle lying in plane ofsection, the other cut through obliquely; eight chromosomes. Fig. 66.—Late anaphase stages, second division; eight chromosomes on eachhalf of each spindle. Fig. 67 a.—Equatorial-plate stages, third division; nuclei in end of ascus; onepolar and one side view of the spindle figures. Fig. 67 b.—^Larger nuclear figure from same ascus, which will form functionalnuclei; nuclear membrane still intact. Fig. 68.—Anaphase stages of third division; eight chromosomes on each spindle-half. \o7
Text Appearing After Image:
104 EXPLANATION OF FIGURES IN PLATES. Plate VII.—Phvllactinia corylea, except where otherwise indicated. Fig. 69.—Erysiphe cichoracearum. Dispirem stages; third division; polar astersstrongly developed. Fig. 70.—Beaked nucleus and aster in early stage of spore formation; two super-numerarv- nuclei at opposite end of ascus and lying with their central bodies onthe plasma-membrane of the a.scus. Fig. 71.—Beaked nucleus and aster, opposite which the plasma-membrane isdrawn in forming an oval depression. Fig. 72.—Beaked nucleus with aster strongly developed; central body broaderthan end of beak. Fig. y^.—Erysiphe cichoracearum. Metamorphosis of the polar aster to formthe plasma-membrane of the spore; early stage in folding over of the rays; twosupernumerary nuclei present; transverse section of part of membrane of thirdspore shown in lower part of figure. Fig. 74.—E. cichoracearum; the rays have formed broad, bell-shaped membranesabout the nuclei; beak of nucleus lying to th

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