Loading...
Please wait, while we are loading the content...
Similar Documents
Asplenium X Clermontae Sim from Clifton Gorge, Greene County, Ohio - A Second North American Record
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wagner, Warren H. Wagner, Florence S. |
| Copyright Year | 1976 |
| Abstract | The Ohio Asplenium X clermontae, like the earlier collections from Vermont, seems to differ slightly from the european examples of the same hybrid combination in the structure of the basal pinnae. We examined the mciotic chromosomes in spore mother cells taken from the greenhouse-grown plants. The parents at this locality arc both tetraploids, each with n = 72, 2» = 144. We can conclude we have at least an approximate estimate of pairing behavior in the hybrid. OHIO J. SCI. 76(3): 99, 1976 Although traditional manuals (e.g., Fernald, 1950) do not mention the presence of Asplenium X clermontae Sim, the hybrid of wall rue spleen wort, A. ruiamuraria L. and maidenhair spleen wort, A. trichomanes L., the plant was recorded by Davenport (1906) and Clute (1908). Miss G. A. Woodson found it near Proctor, Vermont, growing within three feet of Asplenium ruta-muraria and not very far removed from A. trichomanes. Rugg (1912) regarded A. X clermontae as the "rarest of all Vermont ferns." Clute (1908) predicted that the plant would be found in other regions where both the parent species occur together, but, until the discovery reported here, no one seems to have encountered it. A gap of over a half-century separates the two known collections. On 11 November 1962 we found two small plants of A. X clermontae at Clifton Gorge, Greene County, Ohio. At that time Clifton Gorge was an outstanding locality for limestone ferns. We recorded as abundant there such diverse species of spleenworts as Asplenium platyneuron, A. ruta-muraria var. ohionis, A. trichomanes, and Camptosorus rhizophyllus. There were two small plants that appeared to represent A. X clermontae and there were probably others. We took them to Ann Arbor for study in the labManuscript received October 23, 1975, and in revised form February 23, 1976 (#75-63). oratory and greenhouse. Specimens from these plants are illustrated in fig. 1, and were distributed to various herbaria under the field number Wagner 62375. The ferns were planted in a mixture of limestone chips and soil, and they rapidly achieved full size and became fertile. The frond structure left no doubt that they were A. X clermontae. Their spores further confirmed their hybrid nature, being strongly abortive. One of the plants died after several years, but the other grew until 1970, continually producing new fronds. Fronds only 3 cm tall bore sori (fig. 1, d). Small fronds were relatively broad, but older ones were narrower, approaching A. trichomanes in over-all outline (fig. 1, a, e). The largest fronds produced by our plants were nearly 13 cm in length with as many as 9 pinnae on a side. Occasional fronds of average size showed only 4 or 5 pinnae on a side, these separated by rachis segments up to 1 cm in length. Normally, the basal pair or two pairs of pinnae were divided into pinnules (fig. 1 a, d, e) but this was not always the case. Some showed basal pinnae which were only shallowly lobed or not lobed at all (fig. 1, b, c). Different fronds combined the parental characterstates in different ways: Some had numerous pinnae as in A. trichomanes; some had few as in A. ruta-muraria. Some had divided basal pinnae, as noted, some had simple. Some had ovate pinnae, some |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://kb.osu.edu/bitstream/handle/1811/22366/V076N3_099.pdf;jsessionid=BBD92BF12C748D47978BE157CD5ABA88?sequence=1 |
| Alternate Webpage(s) | http://kb.osu.edu/dspace/bitstream/handle/1811/22366/V076N3_099.pdf;jsessionid=90E27F9E06AA1208E8213949C9678101?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
