Phylogeny and Systematics of the Genus Microlepia (Dennstaedtiaceae) based on Palynology and Molecular Evidence

doi:10.11983/CBB17258

Abstract

Abstract: Palynology is an important method to solve the micro-morphological differentiation of species in some complex groups. With the development of molecular phylogeny, combining the advantages of these two subjects may effectively solve the taxonomic issues in plants. Microlepia (Dennstaedtiaceae) is one of the most difficult genera in ferns in terms of taxonomy. In the present study, based on palynology matched with phylogeny and population sampling, we constructed the phylogeny of 280 samples by using both Maximum Likelihood and Bayesian methods with four plastid markers (rbcL, trnL-F, psbA-trnH and rps4). The spore morphology of 100 samples was observed and analyzed. Our results of comprehensive molecular phylogeny and palynology showed that (1) 15 species widely accepted based on plant morphology were strongly supported, and this complex group of Microlepia has been further clarified; (2) There may be crytic species in the populations of M. marginata; (3) M. yaoshanica Ching, M. lofoushanensis Ching, M. szechuanica Ching and M. subspeluncae Ching, treated as synonyms in previous studies, should be restored as independent species; (4) Many hybridization events of Microlepia were found; and (5) A complete infrageneric taxonomy of Microlepia was proposed.

Key words: crytic species, hybrids, palynology, phylogeny and systematics, pteridophytes, taxonomy

Luo Junjie, Wang Ying, Shang Hui, Zhou Xile, Wei Hongjin, Huang Sunan, Gu Yufeng, Jin Dongmei, Dai Xiling, Yan Yuehong. Phylogeny and Systematics of the Genus Microlepia (Dennstaedtiaceae) based on Palynology and Molecular Evidence[J]. Chinese Bulletin of Botany, 2018, 53(6): 782-792.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB17258

https://www.chinbullbotany.com/EN/Y2018/V53/I6/782

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References 55

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