Page 88 - 《广西植物》2026年第2期
P. 88
2 8 2 广 西 植 物 46 卷
Abstract: Hainan Tropical Rainforest National Park is one of the first five national parks established in Chinaꎬ where
comprehensive biodiversity surveys are essential foundations for the construction of the park. The present study
investigated the Limushan area for bryophyte diversity through systematic field survey and voucher collection. The results
were as follows: (1) Detailed morphological examination of the specimens with consultation with relevant literature
revealed one moss species as a new record for China — Mitthyridium obtusifolium ( Lindb.) H. Rob. The main
distinguishing features of the species include creeping main stems with erect branchesꎻ leaves broadly lanceolateꎬ slightly
rugose with a rounded ̄obtuse apexꎻ and leaf sheaths slightly broadened and differentiated borders extending from the leaf
base to near the apex. (2) Detailed morphological descriptions and color plates of the species were provided based on the
newly collected specimens. A global distribution map of M. obtusifolium was givenꎬ showing that this species is primarily
found in tropical regionsꎬ particularly on islands in the Indian and Pacific Oceans and along adjacent continental
coastlines. It typically inhabits tree trunks and decaying wood at elevations below 500 m. The newly recorded occurrence
in China represents the northernmost known distribution for this species globally. A classification key was developed to
distinguish the three known Mitthyridium species in China: M. fasciculatum (Hook. & Grev.) H. Rob.ꎬ M. obtusifoliumꎬ
and M. flavum (Müll. Hal.) H. Rob. (3) A literature review revealed that the taxonomy of Mitthyridium was both
complex and challenging. The phylogenetic relationships between Mitthyridium and the related Syrropodon Schwägr. as
well as between M. obtusifolium and its related M. fasciculatumꎬ were discussed. Mitthyridium is a mainly tropical
lowland distribution genusꎬ thus functioning as an important indicator for conservation and ecological restoration in
lowland rainforest habitats. The discovery of new record not only enriches the floristic data of tropical bryophytes in
Hainan and even Chinaꎬ but also contributes new scientific insights into the taxonomyꎬ identificationꎬ and conservation
of the genus Mitthyridium.
Key words: Hainan Tropical Rainforest National Parkꎬ Limushanꎬ Calymperaceaeꎬ new distributionꎬ tropical islands
花叶藓科( Calymperaceae Kindb.) 隶属于真藓 (1975)发现该属名已经于 1867 年在真菌类里被
门 ( 或 藓 类 植 物 门ꎬ Bryophyta ) 曲 尾 藓 目 发表过ꎬ根据植物命名法的优先原则为不合法ꎬ所
(Dicranales)ꎬ全世界现存 10 属 219 种( Catalogue 以将藓类的同一名称与命名人米顿的姓氏重新组
of Lifeꎬ CoLꎬ https: / / www. catalogueoflife. orgꎻ The 合为 Mitthyridium H. Rob.ꎮ 匍网藓属植物因具有
Bryophyte Nomenclatorꎬ https: / / www. bryonames. 匍匐的主茎和直立上升的分枝ꎬ叶具明显的透明
orgꎻ Tropicosꎬ https: / / www.tropicos.orgꎻ Jia & Heꎬ 网状细胞构成的鞘部ꎬ以及宽阔、多由单层细胞构
2024)ꎬ广泛分布于热带地区ꎬ是全球低地热带森 成的分化边等特征ꎬ使得该属与花叶藓科其他属
林中重要的附生成分( Gradstein & Pcsꎬ 1989)ꎮ 植 物 容 易 区 分 ( 林 邦 娟ꎬ 1996ꎻ Ellis & Tanꎬ
在中国发现的花叶藓科有 7 属ꎬ分别是脆尖藓属 1999)ꎮ 根 据 2025 年 “ Catalogue of Life ” “ The
( Arthrocormus Dozy & Molk.)、 花 叶 藓 属 Bryophyte Nomenclator”和文献记载( Nowakꎬ 1980ꎻ
( Calymperes Sw. ex F. Weber )、 拟 外 网 藓 属 Jia & Heꎬ 2024)ꎬ匍网藓属在全世界有 16 种 1 亚
( Exostratum L. T. Ellis)、 白 睫 藓 属 ( Leucophanes 种和 1 变种ꎬ主要分布于热带低海拔地区的树附
Brid.)、匍网藓属(Mitthyridium H. Rob.)、八齿藓属 生环境中ꎬ并且大多数物种对海洋性气候表现出
( Octoblepharum Hedw.) 和 网 藓 属 ( Syrrhopodon 强烈的偏好性ꎬ因此在东南亚岛屿和沿岸地区和
Schwägr.)ꎬ包括 40 种 1 变种( Reese & Linꎬ 1991ꎻ 赤道附近太平洋众多岛屿上具有较高的物种丰富
林邦娟ꎬ 1996ꎻ 沙伟等ꎬ 2019ꎻ Jia & Heꎬ 2024)ꎮ 度(Nowakꎬ 1980ꎻ Eddyꎬ 1990)ꎮ
匍网 藓 属 是 花 叶 藓 科 中 的 一 个 单 系 类 群ꎮ 中国最早记录的匍网藓属植物标本于 1934 年
1868 年ꎬ英国苔藓植物学家威廉米顿将其定名 采自海南岛(Tso 46ꎬ 55)ꎬ之后陈邦杰带领学生于
为 Thyridium Mitten (Mittenꎬ 1868)ꎬ自此该类群从 1962 年在海南尖峰岭开展苔藓植物调查ꎬ采集了
花叶藓属( Calymperes) 和网藓属( Syrrhopodon) 中 多份匍网藓属标本ꎮ 基于上述海南标本及 1952
分离出来成为 1 个独立的属ꎮ Harold E. Robinson 年吴佑优等采自云南西双版纳的标本ꎬ林邦娟修

