Elementary botany . elementarybotany00atki Year: 1898 FURTHER STUDIES ON GYMNOSPERMS. 215 developed entirely inside of the macrosporangium, and derives the nutriment for its growth from the cycas plant, which is the Fig. 279. Macrosporangium ot Cycas revoluta Fig. 280. Roentgen photograph of same, show- ing female prothallium. sporophyte. Archegonia are developed in this internal mass of cells. This aids us in deter- mining that it is the prothal- lium. In cycas it is also called endosperm, just as in the pines. 430. If we cut open one of the mature ovules, we can see the en- dosperm (prot
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