. Elementary botany. Botany. DIMORPHISM OF FERNS. 341 ferns are examples of this interesting relation between the leaves like the common sensitive fern (Onoclea sensibilis) and the ostrich fern (O. struthiopteris) and the cinnamon fern (Osmunda cinnamomea). The sensitive fern is here shown in fig. 445. The sterile leaves are large, broadly expanded, and pinnate, the. Fig. 445- Sensitive fern ; normal condition of vegetative leaves and sporophylls. pinnae being quite large. The fertile leaves are shown also in the figure, and at first one would not take them for leaves at all. But if we examine
. Elementary botany. Botany. DIMORPHISM OF FERNS. 341 ferns are examples of this interesting relation between the leaves like the common sensitive fern (Onoclea sensibilis) and the ostrich fern (O. struthiopteris) and the cinnamon fern (Osmunda cinnamomea). The sensitive fern is here shown in fig. 445. The sterile leaves are large, broadly expanded, and pinnate, the. Fig. 445- Sensitive fern ; normal condition of vegetative leaves and sporophylls. pinnae being quite large. The fertile leaves are shown also in the figure, and at first one would not take them for leaves at all. But if we examine them carefully we see that the general plan of tl^| leaf is the same : the two rows of pinnae which are here much shorter than in the sterile leaf, and the pinnules, or smaller. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atkinson, George Francis, 1854-1918. New York, H. Holt and company
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