. Introduction to cryptogamic botany. Cryptogams. 466 INTRODUCTION TO CRYPTOGAlVriC BOTANY. the spores; in mosses the cells which do not produce spores are abortive. The spermatozoids are produced exactly as in Hepaticce, and have the same form. In phsenogams the germen is produced before impregnation. It is obvious that no sporangium can be produced in mosses without impregna- ,tion, as the whole depends upon one embryonic cell. Without some system of propagation by gems, many dioecious species would soon die out, in consequence of the rarity of Fig. 99. a. Portion of leaf of
. Introduction to cryptogamic botany. Cryptogams. 466 INTRODUCTION TO CRYPTOGAlVriC BOTANY. the spores; in mosses the cells which do not produce spores are abortive. The spermatozoids are produced exactly as in Hepaticce, and have the same form. In phsenogams the germen is produced before impregnation. It is obvious that no sporangium can be produced in mosses without impregna- ,tion, as the whole depends upon one embryonic cell. Without some system of propagation by gems, many dioecious species would soon die out, in consequence of the rarity of Fig. 99. a. Portion of leaf of Octohlepharum alhidum, from specimens collected by Cuming, seen fi-om above. b. Ditto of Leucobryum glaucum, seen from the inner side, with the intermediate cells. c. Ditto of Sphagnum latifolmm, seen from above. d. Hypopterygium Smithianum, showing the distichous leaves and stipules, with a portion of the edge of the leaf. From a Norfolk Island specimen in the Hookerian Herbarium. e. Permanent mother-cells of Eucamptodon perichcetialis. From a specimen given me by Dr. Montague. /. Andraia suhulata, portion of leaf from Cape of Good Hope. From Hook. Herb. (The light parts, however, ought not to look like per- forations.) g. Campylopus lameUinervis, under side of nerve. From Hook. Herb. All more or less magnified. 514. The leaves of mosses, as regards at least the lamina, usually (Fig. 98, cl) consist of a single stratum of homologous cells as in Jungermannice, but this is by no means 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 Berkeley, M. J. (Miles Joseph), 1803-1889. London, New York, H. Bailliere; [etc. ,etc]
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