3^ BOTANICAL GAZETTE [j.\Nr.\SY 



PLATE IV 



Sporogenesis continued 



Fig, 39. 



cross -sections 



fiS' 3^> granular zone surrounding 



Spore mother cell separated into two hemispheres by granular 



o 



bodies 



ticulura 



fig 



Fig. 42. Side view of nucleus of second division; a little later stage than 

 that given in fig. 41. 



^ Fig. 43. Nucleus in same stage as previous figure; only parts of chromatin 

 reticulum visible in one focus are drawn; V elements distinct. 



Fig. 44. Prophase of nucleus of second division afterdisappearance of nuclear 

 membrane; spindle multipolar. 



Figs. 45, 46. Prophase after bipolar spindle is established; these two figures 

 are in the same stage, the former being the view from the pole of the spore mother 



same 



arms 



second division have become parallel, the ends where spindle fibers are attached 

 lymg in the equatorial region. 



Figs. 48, 49. Late prophase; the two figures represent the same stage, viewed 

 from the equator and pole of the spore mother cell respectively. 



Fig. 50. Metapha^e; t^-o daughter halves m each bivalent chromosome 

 exactly similar in size and shape. 



Fig. 51. Polar view of stage 

 in figs. 48 and jo, this aspect be 



intermediate bet 



figu 



pairs 



equator and pole of the spore mother ceU respectively; two or three 

 aughter chromosomes are tardy in separation. 



54, 55- Late anaphase; the two figures show the same stage \-iewed 



pole of the spore mother cell respectively 



^ Fig. 56. Polar view of daughter chromosomes of late anaphase 

 figs. 54 and 55; 64 chromosomes. 



Fig. 5 7 



lase 



pole and arranged regularly; cell plate laid down at middle region of central 

 spmdks. 



Figs. 58, 59. Telophase; the two figures show the same stage, viewed from 

 equator ^d pole of spore mother ceU; ceU plate has divided the protoplast. 



im, 60. Late telophase; membrane of the granddaughter nucleus formed; 

 new nbers present between granddaughter nuclei of different hemispheres which 

 were separated by granular zone in telophase of first division. 



Fig. 61 Still later condition than stage shown in previous fi<rure; cell plate 

 completed through middle region of granular zone, thus dividing the two proto 

 pksts separated m the first mitosK. 



