. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. MOSSES AND FERNS CHAP. from which arise upright flattened shoots which are repeatedly forked, so that there is a remarkably close .superficial resem- blance to the fan-shaped leaves of certain Ferns, especially some of the smaller Hymenophyllaceae. This resemblance is heightened by the very distinct midrib traversing each thallus- segment. Sexual Organs. The sexual organs in both Aneura and Metsgeria are borne on short branches, which in the latter arise as ventral struc- B; ... Fig. ^o.—Atieu
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. MOSSES AND FERNS CHAP. from which arise upright flattened shoots which are repeatedly forked, so that there is a remarkably close .superficial resem- blance to the fan-shaped leaves of certain Ferns, especially some of the smaller Hymenophyllaceae. This resemblance is heightened by the very distinct midrib traversing each thallus- segment. Sexual Organs. The sexual organs in both Aneura and Metsgeria are borne on short branches, which in the latter arise as ventral struc- B; ... Fig. ^o.—Atieura pinnatiAda. A, Horizontal section of the apex o{ a young antheridial branch, X56S; x, the apical cell; ^, antheridia; B, transverse section of a young archegonial branch, passing through the apical cell (x); J, young archegonia, X525; C, longitudinal section of a nearly ripe archegonium, X262; D, E, spermatozoids of Pellia calycina, X1225 (D, E, after Guignard). tures, but in Aneura are simply ordinary branches that are checked in their growth by the production of the sexual or- gans, and not infrequently may grow out into ordinary branches after the formation of the sexual organs has ceased. In A. pinnatiftda (Fig. 39, B), archegonia and antheridia are usually produced upon separate branches, but may occur to- gether. The origin of the antheridia can be readily followed in. 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 Campbell, Douglas Houghton, 1859-1953. New York, The Macmillan Company;
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
