1915] AASE—M EGASPOROPHYLLS OF CONIFERS 287 
gradually approaches a circle, and in a slightly older bud closes 
to form the cylinder of the shoot. The bud is united with the bract 
at its base, and the general appearance of a young bud and its 
subtending bract is suggestive of a young abietinean sporophyll. 
In Keteleeria Fortunei (figs. 36-57), one bundle originates near 
the base of the gap in the strobilus cylinder and supplies the bract. 
It remains undivided throughout its course. Two bundles, one 
Fics. 30-35.—Pinus Banksiana, vegetative bud: fig. 30, radial longitudinal 
section of bee portion of young vegetative branch; a vegetative bud in axil of each 
bract except at base of branch; fig. 31, origin of bract (6) and bud bundles; figs. 32-35, 
transverse sections, young bundles of bud beginning to form si omaets of branch; X16. 
from each side of the gap, supply the scale. The two bundles 
soon unite, forming one inverted bundle, that is, its xylem faces 
the xylem of the bract. The inverted bundle then breaks, forming 
a semicircle of bundles which spread and divide, forming in the 
scale a row of sixteen or more bundles. Near the ovular insertion 
a small concentric branch is given off to each of the two inverted 
ovules. 
