. Sexual reproduction and the organization of the nucleus in certain mildews. 98 EXPLANATION OF FIGURES IX PLATES. Plate TV.—Phyllactinia cxir\ Fig. 43.—Early stage in synapsis. Fig. 44.—Synapsis; ends of chromatin strands protruding from contracted 45.—Late sjTiapsis stage stained to specially differentiate the central 46.—Loosening up of chromatin after 47.—Early spirem stage. Fig. 48.—Culmination of spirem stage; eight distinct chromatin strands corre-sponding to eight chromosomes of later 49.—Same stage; strands spreading from center witho
. Sexual reproduction and the organization of the nucleus in certain mildews. 98 EXPLANATION OF FIGURES IX PLATES. Plate TV.—Phyllactinia cxir\ Fig. 43.—Early stage in synapsis. Fig. 44.—Synapsis; ends of chromatin strands protruding from contracted 45.—Late sjTiapsis stage stained to specially differentiate the central 46.—Loosening up of chromatin after 47.—Early spirem stage. Fig. 48.—Culmination of spirem stage; eight distinct chromatin strands corre-sponding to eight chromosomes of later 49.—Same stage; strands spreading from center without forming 50.—^Young penicillate cell. Three nuclei showing central si.—Full-grown penicillate cell. Fig. 52.—Transverse section of ascus, showing prophase in formation of 53.—Primary nucleus of ascus; equatorial-plate stage, eight lOO EXPLANATION OF FIGURES IN PLATES. Plate V.—Phyxlactinia corvlea. Fig. 54-—Primary nucleus of ascus, early metaphase. Fig. 55.—Anaphase, eight chromosomes on each half of the spindle. Polaraster strongly developed. Fig. 56.—Late anaphase. Fig. 57.—Diaster; chromosomes still attached to pole bj spindle fibers. Fig. 58.—Reconstruction of daughter nuclei; chromosomes elongating andbecoming irregular strands of chromatin. Fig. 59.—Later stage; strands of chromatin forming irregular cone extendingfrom central body into antipolar region of nucleus.
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