. Plants; a text-book of botany. Botany. Fig. 118. Winged friiit of AUant/iu,-<,—After Kee- ner. reports of "showers of sulphur^' have arisen from an especially heavy fall of pollen that has been carried far from some gymnosperm forest. In the case of pines and their near relatives, the pollen spores are assisted in their dis- persal through the air by developing a pair of broad wings from the outer coat of the spore (see Fig. 110). This same method of j)ollination—that is, carrying the pollen spores by currents of air—is also used by many mono- cotyledons, such as grasses; and by many
. Plants; a text-book of botany. Botany. Fig. 118. Winged friiit of AUant/iu,-<,—After Kee- ner. reports of "showers of sulphur^' have arisen from an especially heavy fall of pollen that has been carried far from some gymnosperm forest. In the case of pines and their near relatives, the pollen spores are assisted in their dis- persal through the air by developing a pair of broad wings from the outer coat of the spore (see Fig. 110). This same method of j)ollination—that is, carrying the pollen spores by currents of air—is also used by many mono- cotyledons, such as grasses; and by many dicotyledons, such as our most common forest trees (oak, hickory, chest- nut, etc.). 7i~i. Dispersal of seeds by air.—Seeds are very rarely light enough to be carried by currents of air without some special adaptation. Wings and plumes of very many and often very beautiful patterns are exceedingly com- mon in . connection with seeds or seed- like fruits (see Figs. , 110, 117, 118, 119). Wings are de- veloped by the fruit of maples and of ash, and by the seeds. Fia. 119. Fruit of basBwood (Tilia), slwwing the peculiar wing formed by a leaf.—After 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and company
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