北海道第三紀層よりニハウルシ屬(Ailanthus)化石の發見

抄録

Some fossil samarae(text-fligs., 2, 3, 4) belonging to the genus Ailanthus were discovered from the Kunnui Series(Kawabataian; Miocene) of Abura, Prov., Siribesi., This is the first fossil occurrence of the genus in Japan, and palaeophytogeographically very interesting, because The genus does not exist in wild state in the Japanese Islands., Ailanthus now distributes rather widely in Asia and Australia, but its section Euailanthus of the subgen., Ailanthopsis, to which our fossil is belonged, grows only in Chjna., Our fossil may be comparable to the living Ailanthus altissima(MILL., ) SWINGLE(fig., 1) of China and A., Confucii UNGER from the European Tertiary., The writers wish to suggest a new specific name, yezoense, for the present specimens.,