四種台灣的淡水紅藻

Occurrence of Four Freshwater Rhodophytes in Taiwan

本文報導台灣島內首次發現的四種淡水紅藻，它們分屬於串珠藻（Batrachospermum ectocarpum Sirod和B. moniliforme Roth），紅索藻（Thorea ramosissima Bory）和胭脂藻（Hildenbrandia rivularis (Liebm.) Bréb）。此四種均分佈於中央山脈中、低海拔的山區溪流，棲地之水溫低，溶氧量高，屬於貧腐水或β-中腐水級的水域。不過，四藻種所棲習之水域水質略有不同，有的在酸性，有的在鹼性環境。本文除對此四藻種之形態、棲地、分佈等作敘述外，並將其棲地之水質環境作比較。

Four species of freshwater rhodophytes are reported for the first time in Taiwan. They are Batrachospermum ectocarpum Sirod, B. moniliforme Roth, Thorea ramosissima Bory, and Hildenbrandia rivularis (Liebm.) Breb. The morphology, habitat, and geographical distribution of these species are described. All of these species are found in clear, cool, and well-aerated subalpine streams in the central ridge of Taiwan. However, they inhabit in the streams with quite different water quality. A comparison between their inhabitations is done.