334 The Botanical Gazette. June, 
the floral axis accompanied by an elongation of the basal por- 
tion of each sporophyll. The growth of the axis is greatest be- 
tween the lowest sporophyll and the upper scale leaves, so that 
the flower is carried out ofits envelope. In the macrosporan- 
giate flower the basal part of the axis is negatively geotropic 
at this time and the flower assumes a more or less upright po- 
sition. Open flowers were collected for about a month dur- 
ing which time the integument grows out beyond the spo- 
rangium forming a vestibule into which a thick fluid substance 
is excreted. In this the pollen grains are caught and held. 
About the time when the flowers open, the transverse thick- 
ening in the bend between the basal and terminal portions of 
the sporophyll begins to increase. This thickening develops 
in all directions nearly at right angles to the basal portion of 
the sporophyl! and by it the flower is closed. This growth 
involves also that part of the base of the sporophyll which 
bears the sporangia and by it the sporangia are inclined to- 
ward the floral axis (figs. 6 and 7). When the flowers close, 
early in February, the middle sporangia on each sporophyll 
are about half way turned toward the axis, and about the first 
of March the micropyles are directed toward the floral axis 
In the thickened part of the sporophyll secondary resin-ducts 
are developed and in the base of the sporophyll fibrovascular 
bundles are formed which end beneath the sporangia. 
The cones continue to grow until about the first of June, 
which time they are 21-24"" in length and 15-17"" in thick- 
ness. The cones open by shrinkage of the fleshy, obconical 
middle portion of the sporophyll, which takes place at the ef 
of the summer, in September, or later in the same year. 
The macrosporangia. 
rcular 18 
vel with 
to exceed the sporangium in length, and when gee as 
closes, about a month later, the integument is about wt se 
long as the sporangium. The micropyle then begins ee out 
by radial elongation of the integument epidermal cells 2 : 
it. In this way the pollen grains on the flat circular 10P 
