A New Record of Pogonatum tahitense (Polytrichaceae) from Tibet, China: Taxonomic Description, Range Expansion, and Biogeographic History

Author:

Sun Yu12ORCID,Song Xiaotong34,Chen Chunfa1,Li Shuang1,Gu Jiqi345,Shao Xiaoming346ORCID

Affiliation:

1. Lushan Botanical Garden, Chinese Academy of Sciences, No. 9, Zhiqing Rd., Jiujiang 332900, China

2. College of Life Science, Nanchang University, Nanchang 330031, China

3. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China

4. Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China

5. State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Life Sciences, Beijing Normal University, Beijing 100875, China

6. Resources & Environment College, Tibet Agriculture & Animal Husbandry University, Nyingchi 860000, China

Abstract

The genus Pogonatum stands out as the most diverse within the family Polytrichaceae, encompassing over 50 species. Pogonatum tahitense has been recorded across various Pacific regions, including Hawaii in the United States and Tahiti in French Polynesia, as well as in Asia, such as in Taiwan in China, Java in Indonesia, and Sabah in Malaysia. In the current study, a specimen collected in Tibet, China, is described, confirming its taxonomic classification as P. tahitense through a comprehensive analysis integrating morphological evidence and molecular study based on sequences from the plastid (rbcL, rps4, trnL-F), mitochondrial (nad5), and nuclear (ITS2) regions. This documentation represents the first record of the species within mainland China. A time-calibrated, molecular-based phylogenetic analysis was conducted, employing various approaches for ancestral range inference. The findings suggest that P. tahitense originated during the Pleistocene epoch, approximately 1.8 mya, in Tibet, China.

Funder

National Natural Science Foundation of China

Special Grants of the Lushan Botanical Garden, Chinese Academy of Sciences

Publisher

MDPI AG

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