. Fundamentals of botany. Botany. 388 STRUCTURE AND LIFE HISTORIES gonium, after the first division of the egg, is a suspensor, but becomes much longer than in Lycopodium, and thrusts the developing embryo deep down among the nourishing cells of the gametophyte. By the possession of a suspensor the Lycopodiales and Selaginellales are distinguished from the Pteridophytes and Catamites. The embryo does not cease growth, and pass through a resting period, but continues to develop, until its root and shoot, with two cotyledons, emerge from the prothallus,. Fig. 284.'—Diagram of life-cycle of Selag
. Fundamentals of botany. Botany. 388 STRUCTURE AND LIFE HISTORIES gonium, after the first division of the egg, is a suspensor, but becomes much longer than in Lycopodium, and thrusts the developing embryo deep down among the nourishing cells of the gametophyte. By the possession of a suspensor the Lycopodiales and Selaginellales are distinguished from the Pteridophytes and Catamites. The embryo does not cease growth, and pass through a resting period, but continues to develop, until its root and shoot, with two cotyledons, emerge from the prothallus,. Fig. 284.'—Diagram of life-cycle of Selaginella. (Modified from J. H. Schaffner.) and the young sporophyte gradually becomes established as an independent, green plant (Fig. 284). It is only after the development of a vigorous leafy shoot, with chloro- phyll apparatus, capable of elaborating an abundance of food, that the strobilus is organized with its axis and green 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 Gager, C. Stuart (Charles Stuart), 1872-1943. Philadelphia, P. Blakiston's son & co.
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Keywords: ., bookauthorgag, bookcentury1900, bookdecade1910, booksubjectbotany
