Subjects: Biology >> Botany submitted time 2023-01-30 Cooperative journals: 《广西植物》
Abstract：
Plants of the lycophyte genus Phlegmariurus contain the chemical compound Huperzine A, the effective medicinal component treating Alzheimer's disease, thus with huge economic value. To protect the natural resources, plants of the whole genus are listed as the National Key Protected Wild plants in China. In this paper, we revised the taxonomy of Phlegmariurus distributed in China based on morphological, ecological, and geographical evidence. We recognized 21 species from China, and organized them into four sections. Sect. Fargesiani X. C. Zhang & R. H. Jiang is newly established, and the other three sections were revised based on previous studies, i.e., Sect. Hamiltoniani C. Y. Yang, emend. X. C. Zhang & R. H. Jiang; Sect. Phlegmariurus; and Sect. Squarrosurus (Herter) X. C. Zhang & R. H. Jiang, comb. & stat. nov. We reduced the following taxon names to synonymies of various species of Phlegmariurus: Huperzia medogensis, Phlegmariurus austrosinicus, P. changii, P. nylamensis, P. cancellatus var. minor, P. qiongzhongensis, and P. shangsiensis.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-03-30 Cooperative journals: 《广西植物》
Abstract： Two new tetraploids quillworts species, Iso雝es longpingii and I. xiangfei, from China are described and illustrated. I. longpingii is a fully submerged plant found in a small pond of Hunan Province. It is morphologically similar to I. sinensis, but differs in its small and tuberculate-cristate megaspores and soft slender leaves that grow up to 60 cm. It is also similar to hexaploid I. orientalis, but differs in its 44 chromosomes and tuberculate-cristate megaspores. I. xiangfei is most similar to diploid I. yunguiensis in megaspore ornamentation, but differs in its microspore ornamentation, oblong sporangium, and 44 chromosomes. There are a few individuals of I. longpingii found in Ningxiang County of Hunan Province, and I. xiangfei is distributed in the wetlands of Tongdao and Huitong counties of Hunan Province. Because of their limited geographic range, small populations, fewer individuals and disturbed habitats, I. longpingii and I. xiangfei are ecaluated as critically endangered (CR) and vulnerable (VU) category, respectively, according to the IUCN Red List criteria. A key to all the current known Chinese quillworts is also provided for further taxonomic identification and conservation of these rare and endangered plants in China.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-06-02 Cooperative journals: 《广西植物》
Abstract： A new species, Selaginella pseudotamariscina (Selaginellaceae), is described from Vietnam. The placement of this species within Selaginella subg. Stachygynandrum is assessed based on a molecular phylogenetic analysis and morphological comparisons with related species. Molecular phylogenetic analyses suggested that S. pseudotamariscina is sister to S. digitata-S. imbricata clade. Morphologically, the new species is similar to S. tamariscina and S. pulvinata by sharing the rosette-forming habit, but distinguished by its dorsal leaves symmetrical, lanceate, sulcate on upper surface; strobili slightly dorsiventrally complanate and non-resupinate, sporophylls resembling vegetative leaves in form and arrangement, non-resupinate, the ventral sporophylls larger than the dorsal ones, dorsal sporophylls sterile, sporangia only borne on the base of ventral sporophylls.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-13 Cooperative journals: 《广西植物》
Abstract： Gongga Mountain is the highest peak of Hengduan Mountains and is an adequate site to study species diversity and the successive distribution of species along altitude. In this study we present an account of the species diversity and floristic characters of lycophytes and ferns in Gongga Mountain based on field survey, specimens identification, and literatures reviewing.The results were as follows: A total of 316 species of 60 genera in 26 families of lycophytes and ferns were recognised in this study. Of these species, six species are assessed to be rare and endangered and need special protection in China. They are Isoëtes hypsophila, Psilotum nudum, Alsophila spinulosa, Aleuritopteris albofusca, Polystichum glaciale and Lepisorus palmatopedatus. Of the fern flora in this mountain, the largest four families are Dryopteridaceae (75 species), Polypodiaceae (56 species), Pteridaceae (54 species), and Athyriaceae (37 species); The largest four genera are Polystichum (45 species), Dryopteris (24 species), Athyrium (24 species), and Lepisorus (19 species). Temperate species are the dominant floristic elements (286 species, 93.77%) in this mountain. With the ascending of the elevation from 1 000 to 3 000 m, the species diversity gradually increases, which reaches the highest at the zone between 2 000–3 000 m where 192 species (belonging to 60 genera in 20 families) were recorded; Above 3 000 m, the species diversity declines, with only four species found over 4 500 m. When viewing the floristic elements, the Sino-Himalaya species are found to be gradually increased along the ascension of elevations.
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