Floristic or gamma diversity of bryophyte vegetations were studied for fifteen islands scattered on the adjoining sea and five localities in the mainland of Nagasaki Prefecture, northwestern Kyushu, Japan. A total of 167 bryophyte species on islands and 135 species in mainland were observed respectively. Highly positive correlations were seen between the area and number of species in islands and mainland. The regression equation was log y=0.373 log x+4.212, where y is the predicted number of species and x is the island area (km^2). The correlation coefficient was 0.989. On the other hand, the regression equation in mainland was log y=0.350 log x+5.199, where y is the predicted number of species and x is the investigated area (km^2) in the mainland. The correlation coefficient was 0.969. Moreover, the bryophyte flora in the mainland was larger than the one of the islands at same area scale.

抄録全体を表示

Riccia nigrella DC. is recorded for the first time from Japan. It closely resembles Riccia sorocarpa Bisch. in appearance, but is distinguished from the latter by color of thallus and longpersistent epidermal cells. Description and illustrations to the species are given based on the Japanese material with some taxonomic and ecological notes.

抄録全体を表示

Splachnum melanocaulon (Wahlenb.) Schwagr. is added to the moss flora of Japan. It was found in the subalpine coniferous forest, about 1,700 m alt., on north slope of Mt. Nantai-san, Tochigiken, Honshu, Japan. It was found with many young sporophytes on an old deer dung on the forest floor, on May 29, 1988. The sporophytes of this species grow much earlier than those of S. ampullaceum which are usually found in August to September in Japan.

抄録全体を表示