Title: On the Sessile Diatoms in the Brackish Water Area of the River Yodo. II
Abstract: In this paper the author deals with the diatom from the Yodo estuary of Osaka, Japan. The samples were taken from the surface of the stone at four stations near the river mouth of the River Yodo on October 12, 1977. In all 49 taxa of diatoms were identified, of which 37 were alive and 12 were observed only in cleaned material. These 12 taxa of the empty or dead frustules were mainly composed of oligo or mesohalobous forms, and they seem to be allochthonous in origin. Living diatoms were composed of marine or brackish water forms. Arranging the genera in order of the greater number of species, variety and form, the Navicula-Amphora-Nitzschia or Navicula-Nitzschia-Amphora type, was recognized. This may be one of the characteristics of the epilithic diatom flora of the Yodo estuary. The common living diatoms found in the lowest course of the Yodo are as follows : Licmophora gracilis var. anglica, Achnanthes kuwaitensis, A. pseudogroenlandica, Pleurosigma barbadense, P. sp. I, Navicula agnita, N. diserta, N. hyalosirella, N. normalis, N. tripunctata var. shizonemoides, N. sp. I, III, Amphora angusta, A. polita, A. sp. I, II, Nitzschia frustulum and N. inconspicua.