1917] DUPLER—TAXUS CANADENSIS 135 
Fic. 35.—The 2 cells resulting from first division of one of the two mega- 
spore mother cells. 
Fic. 36. —Mesaspore tetrad, division of two lowest as yet incomplete. 
Fic. 39.—Innermost megaspore dividing, 3 outer ones degenerating. 
Fic. 40.—Two-celled female gametophyte from division of inner mega- 
spore; second megaspore has e 
Fic. 41.—Inner megaspore decided, other 3 showing no signs of dint: 
gration. 
. PLATE XIII 
Fic. 42.—Four megaspores have enlarged considerably and nucleus of one 
divided. 
Fic. 43.—Second of the 4 megaspores has divided; first has enlarged 
somewhat, the two innermost retaining their normal size and aj ie. 
Fic. 44.—Third and fourth megaspores have each divided twice, second 
megaspore has enlarged, while _ one is beginning to degenerate. 
Fic. 45.—Second division of megaspore. 
Fic. 46.—Third division of megaspore; note beginning of formation of 
Fic. 48.—Group in ‘which forst ‘and third megaspores are dees 
rely, See toe aie Oat Droliey  eee 
female gametophyte. 
Ric. , 49 —Tangential view of a few nuclei and connecting oo 
eas se-—Female gametophyte showing single layer of cells. 
IG. 51. } i: Sev onc tea tucker 7) 
cnn, lower with tissue just completed, probes closing embryo — 
peice foe ae whose outer ends abut on margin. _ a aneme Noe 
___ Fic. 52.—Female gametophyte at 3 different sane, * at time of - mplete 
csing of cavity (Bg, 52) at ime of fetlztion, nd , 
EM AGED SLdIC, 
"PLATE xv 
he 55—Uoverprtino 
initials. 
