. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 394 MOSSES AND FERNS CHAP. ies resembling the oil bodies of Liverworts are also met with in this genus. The sexual organs closely resemble those of the Polypodiacese, but the antheridia have a well-marked stalk, something like that found often in the Hymenophyllacese. Among the many genera and species aside from these, while there is extraordinary variety, the differences are all of second- ary importance, and consist mainly in the form and venation of the leaves and the position of the sporan
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 394 MOSSES AND FERNS CHAP. ies resembling the oil bodies of Liverworts are also met with in this genus. The sexual organs closely resemble those of the Polypodiacese, but the antheridia have a well-marked stalk, something like that found often in the Hymenophyllacese. Among the many genera and species aside from these, while there is extraordinary variety, the differences are all of second- ary importance, and consist mainly in the form and venation of the leaves and the position of the sporangia. The leaves range from the undivided ones of Vittaria or Scolopendrium to the. Fig. 232.—Platycerium alcicorne. A, Whole plant, much reduced; B, tip of a spo- rophyll, showing the crowded sporangia. (A, after Coulter; B, after Diels.) repeatedly divided leaves, usually pinnate, of such forms as Pteris aquilina. In some tropical epiphytic species, such as Asplenium nidus, Platycerium, species of Polypodium, the leaves are arranged so that they form receptacles for collecting humus. In the two latter genera these leaves are very much modified, the two forms of leaves being familiar to all botanists in the common Platycerium alcicorne, where the closely over- lapping round basal ones are very highly 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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