542 
Gibb s.~ — On the Development of the 
seen to be free from the latter (PI. LIII, Fig. 76). Where two bracts are fertile, 
they appear to be opposite, but, as stated before, this is only a question of 
packing, as one is invariably younger than the other (PI. L, Fig. 28, 0. s.). 1 
Histology. In a microphotograph of a radial longitudinal section of 
the youngest stage available (PL LIII, Fig. 76) the initial distribution of the 
tannin cells shows well. They are seen in three or four layers outlining 
the bases both of the fertile bract and scale, also the laminae of both, to 
continue in the epidermis only of the latter in the region of the micropyle, 
and in that of the integument and nucellus, where free (Fig. 76). This 
distribution is further emphasized in transverse section of the same stage, 
taken through the nucellus (Fig. 77) 
There are, as yet, no tannin cells at the periphery and base of the 
integument and nucellus. This zone is initiated, as in Saxegothaea ( 57 , 
p. 144), with the enlarging megaspore on pollination. In Fig. 76 the cells at 
the base of the ovule are in active division, the zone of growth being basal, 
as Saxton ( 44 ) describes for Callitris. The apical cells of the integument 
at the micropyle are not yet lignified. 
The base of the ovuliferous scale on the ventral side shows swellings, 
which recall the structure of the scale bases in § Dacrycarpus (PL XLIX, 
Figs. 8, 9, and 13). 
Two bundles, with resin canals, showing the usual reversed orientation, 
run down the scale (PL LIII, Fig. 77). The course of the bundles is essen- 
tially as described for P. spicata (see p. 540). These bundles arise in the apex 
of the scale, which is produced (PL L, Fig. 29, 0. ^.), though not to the 
same extent as in P. spicata . 
The two strands, each with a resin canal, do not exactly face each 
other in the extreme apex, as in the above species, but converge more 
or less as they descend the scale (PL LIII, Fig. 77), gradually rotating until 
the phloems are side by side. Then the strand of the fertile bract slips in 
between and the three bundles are inserted on the ring of distinct bundles 
in the strobilus. 
In the fertilization stage from the same tree (PL L, Fig. 29, o.s. scarbrs) 
the ovuliferous scale rises well up above the bracts. The imbricating scale 
leaves of the peduncle still persist, but the laminae of the bracts of the 
strobilus have been shed, including that of the fertile bract, leaving only 
cicatrized scars. 
1 In P. ferruginea we get an interesting reduction in the organization of the strobilus as 
compared with that of P. spicata. The peduncle, clothed with scale leaves, is shortened, as is also 
the axis of the strobilus, on which the bracts are massed close together, and not only reduced in 
number but also in fertility, the lower ones being all sterile, with one or two of the apical bracts alone 
fertile, and there is no apical bud. This reduction is also indicated in the Stachyotaxus series, as in 
S. elegans (62, t. 3, Figs. 1 and 2). Nathorst figures the strobili in a similar lateral position, with 
the peduncle reduced in length and in the number of bracts, all of which are fertile, but, though still 
showing an appreciable interval between each bract, the spacing is more than is the case in 
S. septentrionalis. 
