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Contents: H.Suzuki: Distribution of Sphagnum species in Japan and an attempt to classify the moors basing on their combination/ H.Inoue:Distribution and speciation of certain sections of Plagiochila/N.Takaki: Geographical distribution of Japanese Dicranum species in theNorthern Hemisphere/ G.L.Smith: Continental drift and the distributionof Polytrichaceae/ H.Ochi: Some problems of distributional patterns and speciation in the subfamily Bryoideae in the region including Eurasia,Africa and Oceania/ H.Ando: Distribution and speciation in the genus Hypnum in the Circum-Pacific region/ W.C.Steere: Chromosome numbers in bryophytes/ Z.Iwatsuki: Geographical isolation and speciation of bryophytes in some islands of eastern Asia/ T.Koponen: Speciation on Mniaceae/ A.Noguchi: On the distinction of the genera of Hylocomiaceaeand Rhytidiaceae/ R.M.Schuster: Evolving taxonomic concepts in theHepaticae, with special reference to Circum-Pacific taxa/ S.Hattori:Frullania tamarisci-complex and the species concept/ E.Lawton: The genus Rhacomitrium in America and Japan/ A.J.Sharp: Phytogeographical correlations between the bryophytes of eastern Asia and of North America/ H.Crum: The geographic origins of the mosses of North America' seastern deciduous forest.