The structure & development of the mosses and ferns (Archegoniatae) . Fig. 202.—A, Young microsporangial sorus oi , X 80 ; col, columella ; id, indusium ; B, nearly ripe microsporangium, X 225. is repeated with great regularity, and can be traced for a longiime. It is not unlike the arrangement of cells figured by Prantl ^in some of the Hymenophyllaceae. The fully - developed leaves of Azolla are all alike. InA. filiculoides the two lobes are of nearly equal size, the loweror ventral one, which is submersed, somewhat larger, but simplerin structure. The dorsal lobe shows a la
The structure & development of the mosses and ferns (Archegoniatae) . Fig. 202.—A, Young microsporangial sorus oi , X 80 ; col, columella ; id, indusium ; B, nearly ripe microsporangium, X 225. is repeated with great regularity, and can be traced for a longiime. It is not unlike the arrangement of cells figured by Prantl ^in some of the Hymenophyllaceae. The fully - developed leaves of Azolla are all alike. InA. filiculoides the two lobes are of nearly equal size, the loweror ventral one, which is submersed, somewhat larger, but simplerin structure. The dorsal lobe shows a large cavity near its base(Fig. 204, A), which opens on the inner side by a small the outer side the epidermal cells are produced into shortpapillate hairs, which in some species, A. Caroliniana, aretwo-celled. Stomata of peculiar form (Fig. 204, B) occur on 1 Prantl (i), PI. I. Figs. 2, 3. XII LEPTOSPORANGIA T^ HETEROSPORE^ 393 both outer and inner surfaces. The bulk of the leaf iscomposed of a sort of paHsade parenchyma, and the cavity ispartly encircled
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Keywords: ., bookcentury1800, bookdecade1890, bookidstructuredev, bookyear1895
