J Syst Evol ›› 1982, Vol. 20 ›› Issue (1): 73-77.
• Research Articles •
Ching Ren-Chang, Wang Zhong-Ren
The fern Athyrium crenulato-serrulatum Makino is found in the whole of
Northeastern Asia embracing Northeastern China, Korea, Japan, Ussuri and the Far
East USSR. It is similar to the European Athyrium distentifolium, formerly known
as A. alpestre, in having exindusiate round or ovate sori, but differs in several
essential characters, such as the well-spaced fronds are biseriately arranged along a
thick and long-creeping rhizome, the base of stipe is thickened and not attenuated towards the point of attachment, the deltoid-ovate lamina with the basal pinnae as long
as those next above, which all are distinctly petiolate and the rachis, costis and especially the costules of pinnules clad in fine pale-colored generally septate hairs underneath. All these clearly show that the fern in question is not an Athyrium sen. str.
neither Pseudoathyrium Newman to which latter the fern was referred by Nakai.
However, we have been long suspicious of its proper systematic position. In his recent
monograph on the genus Cornopteris (Acta Phytotax. Geobot. 30: 104. 1979.) Kato
has pointed out that C.crenulato-serrulata (Makino) Nakai “has the northernmost
destribution in the genus and exhibits a few characteristics similar to Athyrium, the
swollen base of stipes with projections and cartilaginous lamina margin. By these
characteristics the species is clearly discriminated from other species”. According to
Kurita (1964), Mitui (1970) and Karo (1978) the species in question has chromosome
numbers n=40, the base number of the subfamily Athyrioides instead of x=41, the
base number of the subfamily Diplazioides including Cornopteris Nakai. Since thefern in question fits no other athyrid genera, hence a new genus is proposed.
Ching Ren-Chang, Wang Zhong-Ren. On the systematic position of Athyrium crenulato-serrulatum Makino from North-eastern Asia[J]. J Syst Evol, 1982, 20(1): 73-77.
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