. The fern allies of North America north of Mexico. Pteridophyta; Botany. THE SALVINIACEyE. JiNCE all vegetation requires a cer- tain amount of water for its processes, it is not unusual for various species of plants to be found growing in swamps and bogs, or even in lakes and ponds, but cases in which plants have entirely severed their connection with the earth and tals-en to floating on the surface of the water are far less common. In a survey of the vegetable kingdom, however, we find that all the great groups have species or even whole families that have adopted this mode of life. Amon
. The fern allies of North America north of Mexico. Pteridophyta; Botany. THE SALVINIACEyE. JiNCE all vegetation requires a cer- tain amount of water for its processes, it is not unusual for various species of plants to be found growing in swamps and bogs, or even in lakes and ponds, but cases in which plants have entirely severed their connection with the earth and tals-en to floating on the surface of the water are far less common. In a survey of the vegetable kingdom, however, we find that all the great groups have species or even whole families that have adopted this mode of life. Among the flowering-plants the little duckmeats {Lemnd) are likely first to come to mind, but there is the great water hyacinth (Piaropus), of Southern waters, and many another, like the bladderworts, nearer home. Among the liverworts various species of Riccia are found float- ing, and even the ferns have provided an instance in that remarkable floating fern, Ceratopteris thalictroides. It is not surprising, then, to find a family of the fern allies like the Salviniaceae committed to such an existence. Indeed it is sometimes suggested that the Salviniace^. 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 Clute, Willard Nelson, b. 1869. New York, F. A. Stokes
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1905
