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This illustration shows the flower and sporophylls of Angiosperms: 1, flower of Sedum with leaf-like perianth, p; microsporophylls, s; megasporophylls, c. 2, microsporophyll of the buttercup, showing four-lobed anther and filament. 3, diagram of a cross-section of anther, showing the breaking down of the tissue about the four sporangia and the beginning of the opening of the anther. 4, one of the sporangia from a young anther, as seen in cross-section-m, spore mother cells. The large cells surrounding the mother cells are nourishing cells, known as the tapetum, and disorganize as the spores mature. At the right a mother cell forming four microspores, the upper one being characterisitic of dicotyledons and the lowr of monocotyledons.

Angiosperm

This illustration shows the flower and sporophylls of Angiosperms: 1, flower of Sedum with leaf-like…

"Frond of fern bearing sporangia in sori."—Finley, 1917

Fern frond

"Frond of fern bearing sporangia in sori."—Finley, 1917

"One sporophyll with empty sporangia."—Finley, 1917

Sporophyll

"One sporophyll with empty sporangia."—Finley, 1917