. The structure and development of mosses and ferns (Archegoniatae). ains unchanged, but the tissue ofthe thallus below the archegonium grows actively, and sur-rounds the globular foot, which has grown down into the thallusfor some distance, and only the capsule remains within thecalyptra. This large growth of the foot is at the expense ofthe surrounding cells of the thallus, which are destroyed by its 64 MOSSES AND FERNS CHAP. growth, and through the foot nourishment is conveyed fromthe thallus to the developing capsule. That is, the sporogo-nium is here a strictly parasitic organism, growing
. The structure and development of mosses and ferns (Archegoniatae). ains unchanged, but the tissue ofthe thallus below the archegonium grows actively, and sur-rounds the globular foot, which has grown down into the thallusfor some distance, and only the capsule remains within thecalyptra. This large growth of the foot is at the expense ofthe surrounding cells of the thallus, which are destroyed by its 64 MOSSES AND FERNS CHAP. growth, and through the foot nourishment is conveyed fromthe thallus to the developing capsule. That is, the sporogo-nium is here a strictly parasitic organism, growing entirely atthe expense of the thallus. The further grow^th of the spores and elaters was studied inFimbriaria Californica. The spores remain together in tetrads,until nearly ripe. In sections parallel to the surface of theyounger spores (Fig. 26, C) the outer surface of the exosporeis covered with very irregular sinuous thickenings, at firstprojecting but little above the surface, but afterward becomingin this species extraordinarily developed. In sections of the. D.
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
