Huidong is a county of Guangdong Province in southern
China, lying in the eastern region of the Guangdong-Hong Kong-Macao Greater
Bay, and holds rich biodiversity. However, there is no checklist of lycophytes
and ferns available for Huidong due to the lack of a comprehensive survey.
Based on field surveys in recent years, the literature, herbarium specimens, and
molecular phylogenetic analyses of some groups, we conducted crucial
identifications of all specimens available to us from Huidong in order to
document the species diversity and identify the floristic characteristics and
rare and endangered species of lycophytes and ferns in this county. The main results include these five points: (1) New morphological forms were
found in Selaginella
heterostachys, Coryphopteris
angulariloba, C. chingii, and Diplazium virescens. (2) Sphaerostephanos
taiwanensis was confirmed with populations occurring in Guangdong, while Asplenium
guangdongense was not supported to be an independent species from A.
normale. (3) A population of Vandenboschia lofoushanensis, which had
disappeared for nearly a century in the wild, was rediscovered in Huidong. (4)
A total of 11 lycophyte species (belonging to 5 genera and 2
families) and 119 fern species (in 62 genera and 23 families) are recognized in
Huidong. For ferns in this area, the Asia-Tropic distributing element and the
East-Asian element are dominant, each accounting for about 36% species diversity,
with relatively rich species in Polypodiaceae (17 spp.), Dryopteridaceae (15 spp.), and Thelypteridaceae
(15 spp.). (5) Among
lycophytes and ferns in Huidong, thirteen species are rare and/or endangered;
eight species hold Class II national protection status in China, with Huperzia javanica and V. lofoushanensis accessed as endangered (EN) under IUCN criteria. A complete list
of lycophytes and ferns in Huidong, along with
the information on the distribution pattern for each taxon, is provided.
黄俊凯，李孝济，董仕勇
. Species Diversity of Lycophytes and Ferns in Huidong County, Guangdong Province[J]. Subtropical Plant Science, 2025
, 54(2)
: 186
-194
.
DOI: 10.3969/j.issn.1009-7791.2025.02.008
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