Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 427
a large intercellularspace containing a peculiar cell (the germ-ceU), and openingexternally by an orifice at the summit of the projection; butwhen fuUy developed (Fig. 147), it is composed of from tento twelve cells built-up in iavers of four cells each, one uponDD 2 404 MICROSCOPIC STRUCTURE OF… … X °//&553,|S^ Archegonium of Pteris serrulata :—a, as seen from above; a, a, a,cells surrounding the base of the oavity; b, c, d, successive layers ofcells, the highest enclosing a quadrangular orifice:—b, side-view,showing A, A, cavity containing the germ-cell; b, b, walls of the arche-gonium,…
Microscopy
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