1955 年 68 巻 809 号 p. 320-323
Mt. Apoi is situated in the island of Hokkaido, ca. 42°N. Lat., 143°E. Long. It consists mostly of serpentine, attaining an altitude of 810m. above sea _level. As shown in the list I, twenty-seven species were found on serpentine, in which eleven species marked with an asterisk (*) are confined to serpentine and the remaining also occur on various substrata other than limestone. In these eleven species, only Barbilophozia barbata belongs to the holarctic element. The others are mostly endemic in Japan and her adjacent regions and considered to be of southern origin, the center of their distributional area being generally in Middle to Southern Japan, where they occur on the bark of trees and shrubs and various rocks other than limestone. Thus there are no essential serpentine-loving hepaticae so far as the present area are concerned.
At Esamanbetsu north-west of Mt. Apoi, an outcrop of limestone is found on a small scale. Here fourteen species were collected on limestone, as shown in the list II, in which six species are confined to limestone. These six species are endemic in Japan, and its neighbouring territories, where they occur almost exclusively on lime-stone. Thus they may be regarded as calciphile hepaticae.
It may be a most remarkable fact that few or no hepaticae can occur on both serpentine and limestone rocks, so far as the writer's knowledge is concerned. Generally, hepaticae are hardly tolerant to a certain degree of magnecium as well as excess of calcium in the substrata. The injurious effect of the two rocks is not the same physiologically.