<研究報告>伊豆大島におけるベニシダ類の観察
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We analyze a population of the Dryopteris erythrosora group (cf. Dryopteris sect. Bulligerae CHING in 1938 & Dryopteris subsect. Erythro-variae H.ITO in 1939,excl. Dryopteris varia complex) in volcanic Oshima isl., which is located ca. 100 km SSW of Tokyo, and lies in ca. 34°44′N. latitude and 139°24′E. longitude. The vegetation of this island is principally represented by warm-temperate elements, such as the Prunus lannesiana var. speciosa-Neolitsea sericea community. The central area of this island is occupied by natural bare land and Polygono-Caricetum doenitzii okuboi (cf. OKUTOMI et al. 1976). There are no ferns in this area. 128 specimens belonging to the Dryopteris erythrosora group were collected in various places (Fig. 1). These specimens were divided into three types based on the number of spores in each sporangium, i.e. sexual type, apogamous type, and mixed type, with sexual and apogamous type in a sorus. 47 specimens belonged to the sexual type, 79 specimens to the apogamous type, and 2 specimens to the mixed type. The specimens of the sexual type were determined to be Dryopteris caudipinna NAKAI. Specimens of the apogamous type were determined to be Dryopteris erythrosora (EAT.) O.KUNTZE and D. erythrosora var. dilatata (KOIDZ.) SUGIMOTO. Mixed types were determined to be a putative hybrid between Dryopteris caudipinna and D. erythrosora based on the shape of pinna and spore, the number of spores in a sporagium of a sorus, and the size of stomata. But this putative hybrid needs further cytological examinations. Distributions of each species are shown in Fig. 1. Among them, distribution of Dryopteris caudipinna with D. erythrosora and var. dilatata are restricted to the northeastern part of the island (cf. Fig. 1). It is noteworthy that the vegetation of this area was destroyed by lava of volcanic activity 200-400 years ago (cf. OKI et al. 1978). Other parts of this island have older vegetation than this part. The following characters were observed and measured in each taxon : shape of pinna and pinnule, color of indusium, shape and size of spore, and size of stomata. Some results are shown in Figs. 3,4,5,6,& 7. In the putative hybrid of nos. 30 & 110,ratio of sexual type to apogamous type in a sporangium of each sorus is ca. 1 : 1 in no. 30 and 4 : 1 in no. 110 (cf. Table 1).
- 1984-03-22
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