Abstract

Twelve species of the genus Riccia L. from State of West Bengal have been studied critically under SEM. Three rare species, viz. R. melanospora, R. perssonii and R. stricta have been recorded for the first time from the State. The sporoderm of R. crispatula, R. cruciata, R. discolor, R. huebeneriana, R. melanospora, R. perssonii and R. plana from Indian materials have been studied for the first time under SEM. Brief taxonomic descriptions of each species based on observation under Light Microscope as well as Scanning Electron Microscope have been provided along with SEM micrographs.

中文摘要

本文描述位於台灣東北部南澳闊葉林保留區內之神祕湖的矽藻，為系列報告之最後一個部份。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鑑定依據，共描述在湖積物表層出現之17種，分屬於2目4科4屬。其中有9種為臺灣的新紀錄種，即Navicula cryptotenella, Navicula ingrata, Navicula subfasciata, Pinnularia borealis var. rectangularis, Pinnularia interrupta, Pinnularia maior, Sellaphora laevissima, S. vitabunda, and Nitzschia perminuta等。綜合各項資料，顯示此湖有豐富的矽藻資源，在總共發現之76種矽藻中，有33種 (約43%) 為臺灣新紀錄種。此外，此湖之矽藻群落種歧異度和種豐富度都比一般水庫高，推測這些現象與此湖為未受污染之貧養湖有關。

Keyword: Hepaticae, Riccia, West Bengal.