Elementary botany (1898) Elementary botany elementarybotany00atki Year: 1898 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
Elementary botany (1898) Elementary botany elementarybotany00atki Year: 1898 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
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