. Our ferns in their haunts; a guide to all the native species. Ferns. 2S6 THE SENSITIVE AND OSTRICH FERNS. where this author obtained his specimens. In the fourth edition of Amos Eaton's botany published in 1834, the author says : " The leaflets slowly ap- proach each other on squeezing the stem in the ; Many observers will testify that they cannot be made to do so in these degenerate days. The species is some- times called oak fern or oak-leaved fern. In some ancient botanical works it is mentioned as " dragon's bridges," though for what reason, no one seems to know.
. Our ferns in their haunts; a guide to all the native species. Ferns. 2S6 THE SENSITIVE AND OSTRICH FERNS. where this author obtained his specimens. In the fourth edition of Amos Eaton's botany published in 1834, the author says : " The leaflets slowly ap- proach each other on squeezing the stem in the ; Many observers will testify that they cannot be made to do so in these degenerate days. The species is some- times called oak fern or oak-leaved fern. In some ancient botanical works it is mentioned as " dragon's bridges," though for what reason, no one seems to know. The sensitive fern is abundant in nearly all the territory from Canada to the Gulf of Mexico and west to the Mississippi. Scattered colonies occur as far west as Wyoming, and the same species is again noticed in Japan. In Montana, this species, or one exceed- ingly like it, has been found as a fossil. Growing with normal fronds, there is often found a form half-way between fertile and sterile. It was once considered to be a permanent type and given the varietal name of obtusilobata, but it is now known to be due merely to the destruction of the early sterile fronds. It usually contains less leaf surface than the ordinary sterile frond and in cutting resembles the twice pinnate fertile one. Commonly it bears a few abortive sori, all of which show it to be a partially transformed fertile frond. Prof. Geo. F. Atkinson, who made extensive experiments with this plant, found that he was able to produce the variety at will, by , , o«»r/<-a«««*,7/, simply cutting off the early sterile fronds. 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 Co
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