Article

New species and records in the fern genus Didymoglossum for the flora of Seychelles, with notes on the Southeast Asian D. motleyi complex (Hymenophyllaceae)

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Abstract

The fern flora of the Seychelles archipelago remains relatively poorly known. Recent projects involving the development of the Seychelles National Herbarium and study of key biodiversity areas have resulted in extensive explorations of the ferns on the granitic islands. Historical literature, newly collected specimens and older collections have been revised for the fern family Hymenophyllaceae as a prelude for a fern checklist, resulting in several discoveries. In Didymoglossum, specimens were found with a very unusual character: exsert sori. Revision of the specimens, including phylogenetic analyses, revealed that these belong to two distinct species: Didymoglossum beccarianum comb. nov. (until now only known from Southeast Asia) and a new species endemic to Seychelles, which is described as D. beaverianum below. The exact identity of the Southeast Asian species required to review a complex of species previously considered synonymous to D. motleyi. As a result, we propose a taxonomic hypothesis where Didymoglossum motleyi is in fact known from the type only (from Borneo); D. beccarianum includes the synonyms Trichomanes cognatum, T. sayeri and T. minutissimum and is widely distributed from Seychelles to the western Pacific Ocean and finally Didymoglossum (Trichomanes) cultratum comb. nov., which is maintained as a separate species (endemic to Fiji and known from the type only). We conclude by emphasizing the main diagnostic characters in this complex of species, including characters that have been neglected in the past.

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... Christensen (sensu Ebihara et al. 2006) with more than 20 epilithic or low-epiphytic species, mainly found in the New World, all without the presence of a continuous submarginal false veins. On the other hand, subgenus Microgonium Presl with more than 10 epilithic or low-epiphytic species, mainly in the Old World (with only four New World species), characterized by the absence of stellate hairs on the leaf margins and by the presence of a continuous submarginal false veins (Ebihara & Iwatsuki in Ebihara et al. 2006, Senterre et al. 2017). (2006) based on molecular studies, redefined the genus completely and leave it as the initial Desvaux genus, with only two subgenera that correspond to the sections of Christensen and Morton Didymoglossum and Microgonium, this Rhizomes slender, ca. ...
... separation is based on the presence of stellate hairs on the margins(Copeland 1938;Morton 1968), or based on the presence of an infra-marginal false vein (Ebihara et al. 2006) according withSenterre et al. 2017), insteadChristenhusz & Chase (2014)arguing that subdivision of the classical genusTrichomanes is unnecessary as it is monophyletic. I am following the recent classification of PPG (2016). ...
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A new combination is made for a quite rare fern species, Didymoglossum bucinatum, endemic to the states of Hidalgo and Oaxaca, Mexico. A description, illustration and distribution map are provided, as well as a key to the eleven species of Didymoglossum known from Mexico.
... Ecology: an uncommon lowland species found below 300 m; epiphytic on tree trunks. Note: this species was usually identified as D. motleyi (Bosch) Ebihara & K.Iwats., however, Senterre & al. (2017) suggest that D. motleyi is a Borneo endemic species. ...
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