Abstract

This study described 23 species of diatoms, belonging to five families and seven genera found in the Mystery Lake, a slightly acidic lake, located within a hardwood nature preserve in northeastern Taiwan. Of the species described, seven are new record to Taiwan. They are: Cymbella cuspidata, Cymbella mongolica, Encyonema gracile, Gomphonema augur var. turris, Gomphonema clavatum, Brachysira steindorfiana, Luticola mutica f. intermedia. Brachysira is a new genus to Taiwan. The fine structures of each species are described on the basis of observations under the scanning electron microscope.

中文摘要

神祕湖位於台灣東北部南澳闊葉林保護區內，屬於中海拔略酸性的貧養湖。此湖中滋長豐富的矽藻種類，本文描述在湖積物出現之23種，分屬於5科7屬。其中有7種為台灣的新紀錄種，即Cymbella cuspidata、Cymbella mongolica、Encyonema gracile、Gomphonema augur var. turris、Gomphonema clavatum、Brachysira steindorfiana和 Luticola mutica f. intermedia等。Brachysira 屬於台灣新記錄屬。本文主要係以掃描電子顯微鏡下觀察到的微細形態構造為依據。

Keyword: Diatoms, Mystery Lake, morphology, Nanao Nature Reserve