. The fern allies of North America north of Mexico. Pteridophyta; Botany. THE AMPHIBIOUS HE aquatic quillworts are naturally found in lakes and ponds, since few other situations present the unvary- ing water-level and other conditions favourable to their growth. The amphibious quiUworts, on the con- trary, are more frequently to be found along rivers and streams where the receding waters leave them exposed to the air for at least a part of the summer. The few members of this group that grow in lakes and ponds are to be found close to the margin, in which situations they are usuall
. The fern allies of North America north of Mexico. Pteridophyta; Botany. THE AMPHIBIOUS HE aquatic quillworts are naturally found in lakes and ponds, since few other situations present the unvary- ing water-level and other conditions favourable to their growth. The amphibious quiUworts, on the con- trary, are more frequently to be found along rivers and streams where the receding waters leave them exposed to the air for at least a part of the summer. The few members of this group that grow in lakes and ponds are to be found close to the margin, in which situations they are usually above the water for a part of the summer at least. Engelmann s ^uillwort. Among American students of the Isoetcs there are few whose names are more closely associated with the genus than that of the late Dr. George Engelmann, of St. Louis, and it is most fitting, therefore, that the species, Isoetes Engelmanni, which commemorates his name, should be both common and widely distributed. This species may at once be distinguished from the aquatic quiUworts by its much longer leaves. In the quiet waters of lake and pond the leaves of the quill- worts are inclined to be short and arranged in a distinct. 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
