The Ranges of Noteworthy Japanese Bryophytes. IV.

Abstract

In this paper the range of one species of hepatics is treated. 8. Plagiochila yokogursis Steph. Plagiochila yokogurensis belongs to one of the most remarkable endemic hepatics and is commonly found as epiphytic on the barks of trees or rocks in southern part of Japan and Corea. At present Plag yokogurensis is known from 70 localities (32 of which are hitherto known already and 38 are newly added in this paper), viz. 11 in Middle Honshiu, 18 in South-West Honshiu, 12 in Shikoku and 28 in Kiushiu and 1 in Corea. So far as our present knowledge goes, this plant has its northern limit at Mt. Izurukwanon (36°28'L. N.) in Tochigi Prefecture and its southern limit in the Cape of Sata (31°06'L. N.). The macrofrequency of this species in each District is shown in table 7. As will be seen from map 8 and table 7,the centre of its. distribution seems to exist in S. W. [table] Japan. As is seen in table 7,the densities of Plag. yokogurensis in 4 districts of Japan are arranged in the following order : Kiushiu>Shikoku>S. W. Honshiu>M. Honshiu. But the distribution-fall^<1)> is not seen between them. According to the present knowledge, this plant seems to be one of the Japamurian species^<2)>, its highest elevation lies at Mt. Akaishi ascending to 1060m above sea level and its lowest elevation at Wakayama city descending to 5m. Area geogr. Endemic to Japan and Corea.