我国粤东沙菜属(红藻门 杉藻目)的分类鉴定 *

沙菜属Hypnea海藻作为提取卡拉胶的原料之一, 具有重要的经济价值。但由于该属物种地理分布广泛, 表型可塑性强, 且缺乏详细的解剖学特征, 故有关其物种鉴定也就一直存在争议。本文利用冷冻切片技术, 通过形态学和解剖学方法, 对2013—2014年采自粤东汕头的沙菜属海藻进行了形态特征描述。经鉴定, 该地区沙菜属共有4种, 分别为密毛沙菜Hypnea boergesenii、裸干沙菜H. chordacea、长枝沙菜H. charoides和冻沙菜H. japonica。通过对这几种沙菜进行了较详细的内、外部结构特征分析, 给出了它们在国内外的地理分布及习性等信息, 并对沙菜属的科级分类系统(沙菜科Hypneaceae/赤叶藻科Cystocloniaceae)划分以及密毛沙菜是否为独立物种进行了讨论。

Morphological taxonomy of genus Hypnea (Rhodophyta,Gigartinales) from eastern Guangdong,China

Hypnea as one of the raw materials for carrageenan has significant economic value. Due to its wide geographical distribution, strong phenotypic plasticity and lack of detailed anatomical features, the species identification has always been controversial. Using morphological and anatomical methods, we carried out a taxonomic study on genus Hypnea using samples from Shantou, eastern Guangdong province from 2013 to 2014. According to the identification, there are four species, namely Hypnea boergesenii, H. chordacea, H. charoides and H. japonica. We provide the internal and external structural characteristics and geographical distributions of these species, and discuss the division of the family-level taxonomy of Hypnea (Hypneaceae/Cystocloniaceae), including whether H.boergesenii is an independent species.