Organography of plants, especially of the archegoniatae and spermaphyta . the pro-thallus. The arrang-ement resembles somewhat that of Isoetes. but is. spm Fig. 176. Selaginella Martensii. Female pro-thallus, pr^ projecting from the ruptured wall, spin, ofthe megaspore ; ar, sterile archegonium ; etnb\, eiiibryos embedded in the tissue of the prothallus;ct, et, suspensors. Magnified 124. Adjusted afterPfeffer. Lehrb. See Part I, p. 220. ? See Jeffrey, The (Jametophyte of Botrychium viri^iniaiuim, Studies from the University of Toronto,Biological Series, 1S98. ?? See Pruchmann, Ober di
Organography of plants, especially of the archegoniatae and spermaphyta . the pro-thallus. The arrang-ement resembles somewhat that of Isoetes. but is. spm Fig. 176. Selaginella Martensii. Female pro-thallus, pr^ projecting from the ruptured wall, spin, ofthe megaspore ; ar, sterile archegonium ; etnb\, eiiibryos embedded in the tissue of the prothallus;ct, et, suspensors. Magnified 124. Adjusted afterPfeffer. Lehrb. See Part I, p. 220. ? See Jeffrey, The (Jametophyte of Botrychium viri^iniaiuim, Studies from the University of Toronto,Biological Series, 1S98. ?? See Pruchmann, Ober die Irothallien uud die Keimpllanzen mohrerer europiiischer , 1898. 248 ORGAiXS IN EMBRYO OF PTERIDOPHYTA AND SPERMOPHYTA brought about really in quite a different way. As Fig. 176 shows, theembryo is pushed into the prothallus by the suspensor, et. The apex ofthe embryo forms the shoot-portion which curves, evib.^, so that the point atwhich the thick megaspore, spm, is ruptured, is reached. The root, ]]^ (, TV), is laid down relatively late when the embryo is already bent atnearly a right angle to the suspensor, and t
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