schwartsburd
commented
1 year ago I am totally in favor. The Hypolepis species now classified in Hiya have long been considered outsiders in Hypolepis, since the works of Brownsey and Tryon in the 1980s, at least. They have different chromosome base number (29 vs 32), they display a unique leaf scandent habit, with dormant apices, the spines are of a different kind, etc. They do appear as a monophyletic group, removed and far from Hypolepis in every phylogeny done after Shang et al. (2018).
joelnitta
Author(s) of proposal
Hui Shang
Name of taxon
Hiya
Rank of taxon
Genus
Approximate number of species affected
Four
Description of change
Recognition of the new genus Hiya H.Shang belonging to the Dennstaedtiaceae family that includes four species previously included in Hypolepis: Hy. brooksiae Alderw., Hy. distans Hook., Hy. nigrescens Hook., and Hy. scabristipes Brownsey.
Reason for change
PPG I (2016) noted that some species in Hypolepis may need to be transferred to another genus, as they have long attracted attention as morphological outliers in several previous studies, such as Brownsey (1983 & 1987) and Mickel & Smith (2004). Shang et al. (2018) described a new genus Hiya based on phylogenetic evidence and character evolution. In this article, four chloroplast genes including rbcL, atpA, rpL16, and rps4-trnS intergenic spacer (IGS) from 32 samples, representing 24 species of Dennstaedtiaceae, were used. The Hiya clade was recovered distinct from Hypolepis and resolved as sister to the clade comprising Blotiella, Paesia and Histiopteris. Shang et al. (2018) also reconstructed ancestral states of 16 morphological characters and found that the Hiya clade is distinguished by indeterminate, scandent leaves exhibiting rhythmic growth, provided with recurved black-tipped prickles, and stipule-like pinnules that protect the emerging crosier and pinnae departures, rachis-costa architecture where the adaxial sulcus is confluent with the next lower order, and a base chromosome number of x=29. Shang et al. (2018) transferred the species previously identified as Hy. brooksiae Alderw., Hy. nigrescens Hook., and Hy. scabristipes Brownsey. to the new genus Hiya. Subsequently, Perrie et al. (2018) transferred another species, Hy. distans Hook. to Hiya, based on phylogenetic analysis of rbcL and rpL16 sequences, along with morphological and cytological characters, and revised the morphological description of Hiya by the adaxial sulcus of the primary pinnae confluent with the rachis, veins reaching the lamina margin at an indentation, and the primary pinnae arising at ± 90° from the rachis. This genus has been widely recognized by recent Dennstaedtiaceae researches such as Schwartsburd et al. (2020), Lu et al. (2020), Du et al. (2021), Lu et al. (2022), Triana et al. (2022), and Wang et al. (2022).
Reference(s) for publication of the name
Shang, H., Sundue, M., Wei, R., Wei, X.-P., Luo, J.-J., Liu, L., Schwartsburd, P.B., Yan, Y.-H. and Zhang, X.-C., 2018. Hiya: A new genus segregated from Hypolepis in the fern family Dennstaedtiaceae, based on phylogenetic evidence and character evolution. Molec. Phylogenet. Evol. 127, 449– 458. https://doi.org/10.1016/j.ympev.2018.04.038
List the numbers of any related issues
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