Stegnogramma leptogrammoides (Thelypteridaceae), its discovery in China, and synonymy

Abstract

The northwest region of Yunnan province (southwest China), belonging to the Pan-Himalaya, is a hotspot of biodiversity. We report Stegnogramma leptogrammoides from Yunnan as a new discovery for China. This species was identified based on morphological comparison with the type specimens of all similar species, and DNA barcoding was performed to obtain additional evidence. As it was previously recorded to be endemic to Sikkim, the new record provides a case for confirming floristic affinities between Sikkim and Yunnan within the Pan-Himalaya at the species level.

A global phylogeny of Stegnogramma ferns (Thelypteridaceae): generic and sectional revision, historical biogeography and evolution of leaf architecture

“…), and Stegnogramma s.l. is, in turn, sister to Cyclogramma , as reported previously (Smith and Cranfill, ; He and Zhang, ; Almeida et al., ; Luo et al., ). Within Stegnogramma s.l., three well‐supported (ML BS ≥ 99; BI PP = 1.00; MP BS ≥ 78) clades––ST, HA and LE––were identified (Fig.…”

“…). In contrast, the Dictyocline group previously was not found to form a clade with any other sister taxon in that clade (He and Zhang, ; Almeida et al., ; Luo et al., ). In the LE clade, three subclades (i, ii and iii) were identified (Fig.…”

“…Reed, Phytologia 17: 465. 1969.—TYPE: G. King s.n ., Oct. 1883, INDIA, Sikkim, in K & US.DISTRIBUTION: China (Yunnan; Luo et al., ) and India (Sikkim). Leptogramma liui Y.H. Chang & L.Y.…”

“…Phylogenetically, Stegnogramma s.l. is monophyletic and sister to the genus Cyclogramma (He and Zhang, 2012b;Almeida et al, 2016;Luo et al, 2018). Within Stegnogramma s.l., sect.…”

“…Dictyocline forms a clade, and is sister to the clade mixed with the sects. Haplogramma and Leptogramma (He and Zhang, ; Almeida et al., ; Luo et al., ). All previous phylogenetic sampling lacks a number of key taxa, particularly the type of Stegnogramma , S. aspidioides Blume, and the type of (sect.)…”