2092 BOTANICAL GAZETTE [OCTOBER 
Fics. 71-89.—Thuja occidentalis: figs. 71-81, transverse section of strobilus axis, 
showing origin of sterile bract bundles (sib, sib') below Coste, bract bundles audi . 
sporophylls, and scale bundles (s-s4); fig. 82, t is, ma 
of scale bundles become oriented like bract bundle, two pairs of sporophylls ere 
rophyll, the other two ovules; figs. 83, 84, transverse 
sections near tip of soak: bract (B) and scale (S) beginning to separate; fig. 85, 
longitudinal section of sporophyll, bract (B) and scale (S) closely united; figs. 86- 
89, sections parallel to cone axis; fig. 86, bract (b) and scale (s) bundles iis in 
origin in upper part of oe united in lower (bs); figs. 87-89, bract pod separat- 
ing from scale bundles; X16 
