106 Humphrey . — The Development of 
11. The number of neck-cells is normally five, though occasionally six. 
12. The first division in the embryo results in two nearly equal cells. 
From the epibasal portion arise capsule and seta, the hypobasal cell giving 
rise to the foot. 
This division is followed by another horizontal one in the epibasal 
ceil, separating capsule and seta initials. 
Another horizontal division in the hypobasal cell leaves the embryo 
consisting of four superimposed cells. 
13. Vertical divisions now occur, giving rise to four cells from each 
initial, with the exception of the foot-cell, which does not divide till much 
later. 
14. Periclinal walls now appear, one for each archesporial quadrant. 
This is followed by further divisions, occurring most frequently in the foot 
and archesporium. 
15. The seta is commonly about seven cells in diameter, and elongates 
but little till maturity of spores. 
16. The archesporial cells divide rapidly, forming, ultimately, elater- 
initials and spore-mother-cells. The spores develop in tetrads, separating 
before rupture of capsule-wall. 
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