Biology

Cover Biology
Biology
Gary N Gary Nathan Calkins
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The ordinary fern plant is the asexual generation, i. E. , it does not form the sex cells but, like the hydroid, it gives rise without fertilization to an organism different from itself. These dissimilar organisms are formed 120 PLANTS, THE FOOD OF ANIMALS FIG. 49. -Development of a fern (Aspidium) sporangium, a, The young spor- angium-forming cell just divided from its parent epidermis cell; b, c, d, e, f, different aspects of the dividing cells of the spore capsule; g, origin of the tapetal c...ells and formation of the spore-producing cell or archesporium (ar) ; h, increase of the tapetal cells (/) and formation of the spore mother cells; i, j, k, further stages in the development of the sporangium; an, annulus; pd, pedicel. (From Sedgwick and Wilson. ) REPRODUCTION OF THE FERN 121 from spores which develop on the under surfaces of the leaves. In nature sporulation of Pteris usually occurs in August and in allied forms sometime during the summer months. The margins of the mature leaves of Pteris when ready for spore formation turn under and form elongated pockets which extend throughout the length of the pinnules.

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