中国红蒴真藓复合群和一个新记录种

Bryum atrovirens Brid. complex(Bryaceae, Bryophyta)of China, including a new species record

关键词:  星形真藓, 根生芽胞, 真藓属, 新记录, 分类

Key words:  Bryum stellituber Arts, tubers, Bryum, new record, taxonomy

摘要:

该研究以经典分类学方法探讨了中国红蒴真藓复合群(Bryum atrovirens Brid. complex),重点关注根生芽胞特征在分类中的价值。以期厘清中国红蒴真藓复合群的特征和物种组成; 明确各物种之间的分类界限和地理分布。结果表明:(1)中国该复合群共有9种,即毛状真藓(B. apiculatum Schwägr.)、红蒴真藓(B. atrovirens Brid.)、瘤根真藓(B. bornholmense Wink. & R. Ruthe)、棒槌真藓 [B. clavatum (Schimp.)Müll. Hal.]、球根真藓(B. radiculosum Brid.)、齿缘真藓(B. rubens Mitt.)、沙氏真藓(B. sauteri Bruch & Schimp.)、星形真藓(B. stellituber Arts)和土生真藓(B. tuberosum Mohamed & Damanhuri),其中星形真藓为中国新分布种,首次观察到该种的孢子体以及红蒴真藓和齿缘真藓的中国标本产生根生芽胞。(2)该类群是适应临时环境的短命植物,主要通过根生芽胞进行无性繁殖,最主要的识别特征是芽胞的位置、颜色、形状、大小、细胞壁厚度和外层细胞是否突起及其程度等。(3)明确了每种的地理分布。综上所述,可根据根生芽胞的形态特征快速进行中国红蒴真藓复合群分类鉴定,新记录种的发现丰富了中国藓类植物新资料。

Abstract:

The Bryum atrovirens Brid. complex in China was critically revised based on morphological evidence, with a focus on the tubers. The aim of the study is to clarify the morphological delimitation, and geographical distribution for each recognized species of this complex in China. The results show that:(1)Nine species are recognized for the complex in China, namely B. apiculatum Schwägr., B. atrovirens Brid., B. bornholmense Wink. & R. Ruthe, B. clavatum (Schimp.)Müll. Hal., B. radiculosum Brid., B. rubens Mitt., B. sauteri Bruch & Schimp., B. stellituber Arts and B. tuberosum Mohamed & Damanhuri. B. stellituber represents a new record for China, whereas sporophytes are for the first time recorded in two populations of the new record, and the rhizoidal tubers of B. atrovirens and B. rubens are first documented from Chinese material.(2)Species of the B. atrovirens Brid. complex are ‘ephemeral' colonists adapted to the exploitation of short-lived habitat gaps. Asexual reproduction by means of tubers was observed to be common and numerous. Identification of species within the complex relies heavily on the tuber characteristics, including its distribution(along short or long rhizoids, clustered or not), color, shape, size, cell wall thickness, presence of surface protuberance, and degree of protuberance when present.(3)The distribution at global and Chinese provincial levels for each species is summarized. An identification key to species of the B. atrovirens Brid. complex in China is presented. In conclusion, the species identification of the B. atrovirens Brid. complex can be rapidly accomplished based on the morphological characteristics exhibited by the tuber. The species newly record adds data for the moss in China.