Two new species of the Lycophyte Genus Selaginella (Selaginellaceae) from China, with notes on phylogenetic position of related species
Huang, Ling; Li, Shu-Han; Dong, Shi-Yong (2022), Two new species of the Lycophyte Genus Selaginella (Selaginellaceae) from China, with notes on phylogenetic position of related species, Dryad, Dataset, https://doi.org/10.5061/dryad.fj6q573v1
Two new species of lycophytes, Selaginella obovata and S. zhangii, were discovered in southeastern Yunnan, China. Selaginella obovata is characterized by the prostrate habit and relatively small size of plant, obovate median leaves, and short, dorsiventral strobili, and is not apparently similar to any known species. Phylogenetic analyses of plastid sequences (rbcL, atpI, psbA) indicated that S. obovata is closely allied to S. bisulcata, which is also supported by spore morphology, and that these two taxa together with S. pennata constitute a well-supported monophyletic group. Selaginella zhangii is comparable to S. rolandi-principis in their broad stems (including leaves) and shape and arrangement of vegetative leaves; but the former differs from the latter in its prostrate habit and dorsiventral strobili. The result of phylogenetic analyses showed indicate that S. zhangii is allied to S. heterostachys in the S. heterostachys–S. ciliaris clade, while S. rolandi-principis is distantly placed in the S. doederleinii–S. involvens clade. Finally, we provide comprehensive descriptions, photographs of living plants, line drawings, and scanning electron micrographs of spores to facilitate their recognition.