日本に於ける蘚苔植物の分布域研究(第7報)

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概要

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• In this paper the range of the following species of hepatics is treated. 11. Frullanta densiloba STRPH. The species was established by STEPHANI based upon specimens from two localities (Mt. Konomine and Mt. Ishizuchi) in Shikoku. At present there are 64 specimens of Frullania densiloba in our herbarium. They were examined by the writer. In this paper the species will be published for the first time from the five prefectures, of Shizuoka (1), Kyoto (1), Tokushima (1), Nagasaki (2), Kumamoto (2), and new localities will be added to the prefectures of Tokyo (1), Hiroshima (3), Ehime (3), Kochi (5), Miyazaki (4), Kagoshima (2). Map 11 has been prepared based on 66 localities (29 of these localities are new additions and 39 were previously known). As shown in map 11,the northernmost limit of the species in question lies at the Senzu National Forest (35°17´L.N.)in Shizuoka Prefecture and its southernmost limit is at Isi. Botel-Tabago(22°L.N.)in Formosa. With regard to the nature of the substrata, the habitats of 55 closely recorded specimens were examined, the number of specimens collected on tree-trunks is 52 (95%), while those collected on rocks is only 3 (5%)as shown in table 11. From an analysis of the corticolous nature of the host trees with respect to the six districts of the Japanese Islands, it was found that the percentages of specimens on ever-green broad-leaved trees gradually decreases towards the north, from 100%→43%, whereas those on coniferous trees gradually increases, from 36%→100%. [table] The results of macrofrequency in each district are shown in table 12. As seen in this table, the values of macrofrequency in the region from Formosa to Shikoku are generally equal, but that of M. Honshiu becomes suddenly smaller. [table] According to our knowledge, the highest elevation is on Yakushima Island where it ascends to 1550m above sea level and its lowest elevation at Nishidani in Kochi prefecture where it descends to 220m. Geographic distribution, Japan, Liukius, Formosa.

• 日本生態学会の論文
• 1954-12-25

著者

• 堀川 芳雄

  広島大学理学部

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