Abstract

One newly recorded species of Nitella, N. mirabilis Nordstedt ex J. Groves (Charales, Charophyta) was found in Taiwan primarily based on the morphological features. This newly recorded species is characterized by being a monoecious plant, oospore surface appears an anastomosing network and possessing unicellular dactyls. Its monoecious nature and the characteristics of its reproductive organs separate it from other species of the genus. Its vegetative morphology is similar in many respects to that of the monoecious species belong to section Nitella, subgenus Nitella. However, the surface view of the oospores of N. mirabilis appears fibrillar based on the SEM observations due to the occurrence of the anastomosing network of fine fibrils. Such character is unique among the known species of the genus Nitella. N. mirabilis was found in a lake of Fushan Research Station, Yilan County, Taiwan in which the water depth range from a few centimeters to one meter.

中文摘要

本研究報導臺灣產輪藻目麗藻屬一新紀錄種奇異麗藻，依據其雌雄同體、單細胞末枝及合子外部微細構造，可明顯與本屬其他已知種類區分。尤其在掃瞄式電子顯微鏡下觀察到其合子外璧呈現纖細纖維狀，此特徵在本屬其他種類是很獨特的。本新紀錄種奇異麗藻發現於台灣宜蘭縣福山植物園內水池，分布水深約幾公分到最高一公尺環境中。文中對臺灣麗藻進行描述，並提供照片及與其他相近種類之比較。

Keyword: Monoecious, newly recorded species, Nitella mirabilis, oospore, Taiwan.