Recognition of Calligrammitis, Devolia, and Glabrigrammitis, segregates of Oreogrammitis s.l. (Grammitidoideae; Polypodiaceae) [PASSED]

Author(s) of proposal

Li-Bing Zhang, Xin-Mao Zhou

Name of taxon

Calligrammitis, Devolia, Glabrigrammitis

Rank of taxon

Genus

Approximate number of species affected

Description of change

To maintain the monophyly of Oreogrammitis, three new genera, Calligrammitis, Devolia, and Glabrigrammitis have been proposed to accommodate the three clades outside of the core group of Oreogrammitis.

Reason for change

Our recent study (Zhou et al., 2023) showed that the Old-World genus Oreogrammitis sensu Parris (2007, 2013b), Kuo & al. (2019), and Parris & Sundue (2020) is polyphyletic but is resolved into four clades: the core Oreogrammitis, the O. beddomeana clade (O. beddomeana and allies), the O. subevenosa clade (O. nuda + O. subevenosa), and the monospecific O. orientalis clade. The O. beddomeana clade and the O. subevenosa clade are paraphyletic in relation to the core Oreogrammitis + (Archigrammitis + Prosaptia s.l.). The O. orientalis clade is distantly related to the core Oreogrammitis and weakly supported as sister to a clade containing Ctenopterella khaoluangensis (Boonkerdia) and Tomophyllum. The long branches and isolated relationships of each of the three clades outside of the core group of Oreogrammitis suggested that none of them can be placed in any existing genera taxonomically. Therefore, they have recently been described as Calligrammitis (O. beddomeana and allies), Devolia (O.orientalis), and Glabrigrammitis (O. subevenosa and allies), respectively (Yang & al., 2023).

Calligrammitis is similar to those species assigned to Radiogrammitis (now in Oreogrammitis) in having radial rhizomes but is distinguishable from the latter by having no scales (vs. often having scales in the latter) on rhizomes and in lacking sporangial setae (Parris et al. 2015).

Devolia differs from Oreogrammitis in having rhizome scales sometimes with an apical seta, and branched hairs with setae as branches (Knapp & Hsu 2017), whereas Oreogrammitis has glabrous rhizome scales and usually lacks branched hairs with setae as branches.

Glabrigrammitis differs from Oreogrammitis in glabrous, rather than setose sporangia and also differs from nearly all species of Oreogrammitis in having branched hairs with setae as branches. Yang et al