Fine Structure of the Aulacoseira crassipunctata Krammer in Japan

Abstract

The fine structure of Aulacoseira crassipunctata Krammer in Japan was examined us- ing light (LM) and scanning electron (SEM) microscopy. The most defining characteristic of this Aulacoseira species is its lack of rimoportulae. This paper reports the unique valve structure of A. crassipunctata from three localities : Bishamon Pond (Fukushima Pref.), Lake Kussharo (Hokkaido) and Sawano-ike Pond (Kyoto Pref.).