104 BOTANICAL GAZETTE [FEBRUARY 
axis as fast as the axis of the sporophyll itself elongates. Like the 
_ sporophyll itself, the sporangia are first distinguishable as meri- 
ie 
Fics. 5-9.—Fig. 5, cross-section of sporophyll, showing relation of sporangia to 
one another and to the stalk; fig. 6, longitudinal section of a sporophyll, showing 
position of sporangia and course-of their vascular supply; fig. 7, cross-section of a 
_ vascular bundle of sporophyll; fig. 8, cross-section of a sporangium at mother cell 
stage, showing sporogenous cells (s), tapetal cells (¢), 4-6 layers of wall cells, tannin- 
filled epidermal cells, and thin cells where dehiscence will take place; 250-; 8-9 
annulus and stomium just before dehiscence; X 250. 
stematic outgrowths consisting of several cells. Plate fig. 3 shows 
part of three sporangia adjacent to one another in the same row, 
and plate fig. 4 shows a section at right angles to it, showing the 
