Lichens are significant components of the biological soil crust communities in gypsum ecosystems and are involved in several processes related to ecosystem functioning, such as water and nutrient cycles or protection against soil erosion. Although numerous studies centered on lichen taxonomy and ecology have been performed in these habitats, global information about lichen species from gypsum substrates or their distributional ranges at a global scale is lacking. Thus, we compiled a global data set of recorded lichen species growing on gypsum. This review is based on systematic searches in two bibliographic databases (Web of Science and the more specialized database Mattick's Literature Index) using various keywords related to the substrate or ecology (i.e., gypsum, gypsiferous, semiarid, saxicolous, terricolous). In addition, we revised lichen literature from countries with gypsum soils using Mattick's, Hamburg University's Worldwide checklist, and different national lichen checklists. Ultimately the review includes a total of 321 studies. This data set included 6114 specimen records belonging to 336 recorded lichen species from 26 countries throughout the world. The results showed large differences in the number of species recorded among countries, reflecting differences in the sampling effort. We provide a table with the number of studies and species in relation to gypsum surface in order to account for the bias produced by sampling effort. The number of studies carried out per country was not related to the gypsum surface but probably to other factors, such as accessibility to field sampling, economic or political factors, or the presence of a wider community of lichenologists. Thus, Spain and Germany hosted the highest number of recorded species (160 and 114 species, respectively). Outside the European continent, only a few countries had a large number of species: Morocco (46), United States (42), and Iran (37). Remarkably, countries from the southern hemisphere (i.e., Australia, Chile, Namibia, and South Africa) showed a low number of studies from gypsum lands, supporting the stated biases observed in sampling efforts among countries. Considering the most studied countries, the results show that Teloschistaceae was the most represented family in gypsum ecosystems followed by Verrucariaceae and Cladoniaceae. Regarding particular species, Psora decipiens and Squamarina lentigera were some of the most widespread and abundant species in these habitats. This data set constitutes a basic and first step toward a much more comprehensive database, to be periodically updated in future releases, which also serves to identify countries or territories where future studies should be accomplished. There are no copyright restrictions on the data; please cite this data paper if the data are used in publications and teaching events.

中文翻译：

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石膏地衣：石膏生态系统中地衣物种的全球数据集

地衣是石膏生态系统中生物土壤结皮群落的重要组成部分，参与与生态系统功能相关的多个过程，例如水和养分循环或防止土壤侵蚀。尽管在这些栖息地进行了大量以地衣分类学和生态学为中心的研究，但缺乏有关石膏基质地衣物种或其在全球范围内的分布范围的全球信息。因此，我们编制了一个记录在石膏上生长的地衣物种的全球数据集。本综述基于两个书目数据库（Web of Science 和更专业的数据库 Mattick 文献索引）的系统检索，使用与基质或生态相关的各种关键词（即石膏、石膏、半干旱、石生、土生）。此外，我们还使用马蒂克的、汉堡大学的全球清单和不同国家的地衣清单修订了石膏土国家的地衣文献。最终该综述共纳入 321 项研究。该数据集包括来自全球 26 个国家的 336 个已记录地衣物种的 6114 个标本记录。结果显示，各国记录的物种数量存在巨大差异，反映出采样工作的差异。我们提供了一个表格，其中包含与石膏表面相关的研究数量和物种，以解释采样工作产生的偏差。每个国家进行的研究数量与石膏表面无关，但可能与其他因素有关，例如现场采样的可及性、经济或政治因素，或者更广泛的地衣学家群体的存在。因此，西班牙和德国拥有记录物种数量最多的国家（分别为 160 种和 114 种）。在欧洲大陆之外，只有少数国家拥有大量物种：摩洛哥（46）、美国（42）和伊朗（37）。值得注意的是，南半球国家（即澳大利亚、智利、纳米比亚和南非）对石膏地的研究数量较少，这支持了在各国抽样工作中观察到的所述偏差。考虑到研究最多的国家，结果表明，Teloschistaceae 是石膏生态系统中最具代表性的科，其次是 Verrucariaceae 和 Cladoniaceae。就特定物种而言，Psora decipiens和Squamarina lentigera是这些栖息地中分布最广泛和最丰富的物种。该数据集构成了迈向更全面的数据库的基础和第一步，将在未来的版本中定期更新，这也有助于确定未来研究应完成的国家或地区。数据没有版权限制；如果数据用于出版物和教学活动，请引用此数据论文。