Abstract

A newly recorded species, Diplazium crassiusculum Ching, in northern Taiwan is described and illustrated in this paper. It can be distinguished from other congeners by its coriaceous fronds, free terminal pinna, serrate margins, oblong-lanceolate pinnae, and sori solely formed at the acroscopic side of the first veinlet in each venous set. A key is provided to distinguish the morphologically related species of Taiwan. This species is apparently rare and is known only in one location in Taiwan.

中文摘要

本文新紀錄一種產於臺灣北部之雙蓋蕨屬(Diplazium)植物－厚葉雙蓋蕨 (D. Crassiusculum Ching)。本種可藉由革質葉片、獨立頂羽片、羽片長橢圓狀披針形、邊緣 鋸齒狀及孢子囊群發育於每組側脈最基部朝羽片先端之小脈等特徵與臺灣產同屬其他 相似種區分。本文提供其分類描述、手繪圖、照片與分布圖，以及其與近似種類之檢索 表。此物種在臺灣極為稀有，目前僅在一處發現。

Keyword: Athyriaceae, Diplazium, Diplazium crassiusculum, New record, Pteridophyta, Taiwan.