Taxonomic and evolutionary implications of spore ornamentation in Davalliaceae  

作　　者：Fa-Guo Wang Hong-Mei Liu Chun-Mei He Dong-Mei Yang Fu-Wu Xing 

机构地区：[1]Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences,Guangzhou 510650, China [2]Shenzhen Key Laboratory of Southern Subtropical Plant Diversity, Fairylake Botanical Garden, Shenzhen and Chinese Academy of Sciences,Shenzhen 518004, China [3]Guangdong Academy of Forestry, Guangzhou 510520, China [4]College of Horticulture and Landscape Architecture, Hainan University, Haikou 570228, China

出　　处：《Journal of Systematics and Evolution》2015年第1期72-81,共10页植物分类学报（英文版）

摘　　要：Davalliaceae is a small family of derived ferns that grow epiphytic or occasionally epilithic in the tropics and subtropics of the Old World. Despite recent taxonomic and phylogenetic achievements, some aspects of its classification remain controversial, in this study, we provided new spore observations on Davalliaceae by using scanning electron microscopy. The newly generated data were integrated together with previously reported spore evidence of this group. The evolution of spore ornamentation and taxonomic implications of spore characters was optimized onto a phylogenetic tree based on plastid sequences. Verrucate colliculate spore ornamentation was identified as plesiomorphic character state within Davalliaceae. The Humata clade was characterized by the transition from verrucate colliculate to fused verrucate ornamentation. Several species complexes subject to taxonomic controversy were found to show informative variation in the spore ornamentation. In conclusion, our observations support the utility of spores as a morphological taxonomic trait in ferns, as long as the evolution of spore morphology is considered.Davalliaceae is a small family of derived ferns that grow epiphytic or occasionally epilithic in the tropics and subtropics of the Old World. Despite recent taxonomic and phylogenetic achievements, some aspects of its classification remain controversial, in this study, we provided new spore observations on Davalliaceae by using scanning electron microscopy. The newly generated data were integrated together with previously reported spore evidence of this group. The evolution of spore ornamentation and taxonomic implications of spore characters was optimized onto a phylogenetic tree based on plastid sequences. Verrucate colliculate spore ornamentation was identified as plesiomorphic character state within Davalliaceae. The Humata clade was characterized by the transition from verrucate colliculate to fused verrucate ornamentation. Several species complexes subject to taxonomic controversy were found to show informative variation in the spore ornamentation. In conclusion, our observations support the utility of spores as a morphological taxonomic trait in ferns, as long as the evolution of spore morphology is considered.

关 键 词：Davallia Davallodes epiphytic ferns phylogenetic framework spore characters. 

分 类 号：Q949.36[生物学—植物学] Q949.747.3