. Elementary botany. Botany. 312 MOKPHOLOGY. developed entirely inside of the macrosporangiuni, and derives the nutriment for its growth from the cycas plant, which is the. Macrosporangiuni of Cycas revoluta Roentgen ]ihotoeraph of same, show- ing female protlialTiiun. siiorophyte. Archegonia arc developed fn 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. 629. If we cut open one of the mature ovules, we can see the en- dosperm (prothallium) as a whitisli mass of tissue. Immediately sur- roundi
. Elementary botany. Botany. 312 MOKPHOLOGY. developed entirely inside of the macrosporangiuni, and derives the nutriment for its growth from the cycas plant, which is the. Macrosporangiuni of Cycas revoluta Roentgen ]ihotoeraph of same, show- ing female protlialTiiun. siiorophyte. Archegonia arc developed fn 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. 629. If we cut open one of the mature ovules, we can see the en- dosperm (prothallium) as a whitisli mass of tissue. Immediately sur- rounding it at maturity is a tliin, papery tissue, the remains of tlie nucellus (macrosporangium), and outside of this are the coats of tlie ovule, an outer fleshy one and an inner stony one. 630. Microspores, or pollen, of cycas.—The cycas pUant illusiraled in the frorilispiece is a female phuil. Male plants al center that hear. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atkinson, George Francis, 1854-1918. New York : H. Holt
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