袋状地衣（Hypogymnioid lichen）泛指一类地衣体裂片中空，外形如口袋，下表面无假根的类群，目前包括四属：北极梅属（Arctoparmelia），小腊肠衣属（Brodoa），袋衣属（Hypogymnia）和鹿枝衣属（Pseudevernia）。然而，该类群缺乏系统性研究，科级分类地位及属间亲缘关系尚未明确。本项目拟在系统采集我国袋状地衣标本的基础上，广泛收集和借阅国内外馆藏标本，进行形态学特征描述与化学分析，揭示其物种多样性；选择代表性物种，通过构建多基因系统发育树，结合形态学和化学特征，确定袋状地衣科的分类地位及属间亲缘关系，并提出该类群更趋于自然的分类系统；以梅衣科为时间节点，利用ITS的进化速率，推测袋状地衣各分支类群的分化时间，结合地理分布，探讨袋状地衣的系统演化关系。本项目将收集保藏大量袋状地衣标本，发现新的分类单元，为认识、保护及持续利用地衣生物多样提供有力支撑。

Hypogymnioid lichen refer to one type of lichens with hollow lobes, swollen thallus and absence of rhizines on lower surface, which include four genera: Arctoparmelia, Brodoa, Hypogymnia and Pseudevernia. However, there is still absence of systematic study on Hypogymnioid lichen, especially, the family classification and phylogenetic relationship among the four genera are uncertain. This project will largely gather and borrow domestic and foreign Hypogymnioid lichen specimens based on collecting Chinese samples, describe species in morphology and chemistry to explore the species diversity; choose the representative species and reconstruct multi-gene phylogenetic tree, perform the phylogenetic analyses combining the morphological characters and chemical features, and put forward more natural taxonomic system; speculate the divergent time of all the clades of Hypogymnioid lichen based on substitution rate of ITS, taking Parmeliaceae as node of time. A large amount of Hypogymnioid lichen specimens will be gathered and deposited, and new taxa will be found, which could supply strong support for recognizing, protecting and continuously utilizing biological diversity of lichens.