|
|
Fig. 1.—Calamites. Part of transverse section of a young
stem, showing pith, vascular bundles with secondary wood,
and cortex. (× about 40.) From a photograph (Scott, “Studies”).
|
|
|
|
|
Fig. 4.—Palaeostachya pedunculata.
Fertile shoot, bearing
numerous cones and a few
leaves. After Williamson (Scott,
“Studies”).
|
|
|
|
|
Fig. 22.—Lyginodendron oldhamium. Transverse section of stem,
showing the pith containing groups of sclerotic cells, the primary
xylem-strands, secondary wood and phloem, pericycle and cortex.
lt1-lt5, leaf-traces, numbered according to the phyllotaxis, lt5
belonging to the lowest leaf of the five; ph, a group of primary
phloem; pd, periderm, formed from pericycle. (× 3.)
|
|
|
Fig. 31.—Cordaianthus Penjoni. A, Male catkin in longitudinal
section: a, axis; b, bracts; c, d, filaments of stamens, hearing the
pollen-sacs (e and f) at the top; v, apex of axis. (× 61/2.) B, Stamens more
highly magnified: g, vascular bundle of filament; e, pollen-sac
after dehiscence. (× 23.) After Renault (Scott, “Studies”).
|
