<国立科博専報>鹿児島県奄美大島におけるオニヤブソテツ(オシダ科)の生殖型, 分布, 生育地, および外部形態の変化

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Isl. Amami-oshima (Fig. 1) lies in ca. 129°30' E. longitude and ca. 28°20' N. latitude. The temperature of yearly mean is 21.3℃. In this island, as a part of the taxonomic studies of Cyrtomium falcatum, 85 specimens and 9 living stocks of this species were collected from 36 plots (Fig. 1) for the following studies : distribution, habitat, character-variation of laminae, pinnae and indusia, chromosome numbers, and reproductive type. As a result, distribution was restricted within 500 m distance from seaside and below 20 m above the sea level in spite of the wide range of distribution of this species in othe regions. The habitats were very variable : i.e. on rocks in open place near seaside (Fig. 2), with occasionally some flooded stocks at high tide, on cliffs on edges of forests, on stone walls along road, slopes or floors in evergreen broad-leaved forests. All materials (85 specimens and 9 living stocks) belonged to the apogamous type based on the examination of the number of spores per sporangium. Chromosome number of the 9 stocks were 2n=123 (Fig. 3) in root tip mitosis. These facts indicate that Cyrtomium falcatum in Isl. Amami-oshima were proved to be the apogamous triploid taxa. Variation extent in length of laminae, size and shape of pinnae (Fig. 4), and color of indusia were observed and discussed. These characters are very variable. The results are shown that apogamous triploid taxa in Isl. Amami-oshima have intermediate characteristic between sexual diploid and sexual tetraploid species occured in other regions. In the appendix, nomenclatural treatment of sexual diploid, apogamous triploid, and sexual tetraploid taxa of Cyrtomium falcatum (s. l) was discussed.
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<国立科博専報>鹿児島県奄美大島におけるオニヤブソテツ(オシダ科)の生殖型, 分布, 生育地, および外部形態の変化

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