Abstract
Peltigera serusiauxii is proposed here as a new species from Papua New Guinea and Sabah, northern Borneo (Malaysia). The species belongs to the polydactyloid clade of section Polydactylon. Because of its large thalli with a glabrous upper surface, this species was previously identified as P. dolichorhiza, but it differs by its polydactylon-type lower surface and the high amount of dolichorrhizin. It appears to be a strict specialist in its association with Nostoc phylogroup IX throughout its known distribution. This is one of many undescribed species remaining to be formally described within the genus Peltigera, especially in Asia and Australasia.
Highlights
Peltigera is a genus of ascomycetes that mainly form lichen thalli with cyanobacteria of the genus Nostoc
In section Polydactylon, the name P. dolichorhiza has been widely applied to specimens forming large, brittle thalli with a glabrous upper surface in many parts of the world, including Africa (Swinscow & Krog 1988), Asia (e.g., Wei et al 2009) and Australasia (e.g., Kantvilas & Mitchin 1989)
Maximum likelihood (ML) phylogenetic searches were implemented with RAxML version 8.2.12 (Stamatakis 2006; Stamatakis et al 2008) using the CIPRES portal (Miller et al 2010), with the GTRGAMMA model and the best partition scheme retrieved from the PartitionFinder analysis
Summary
Specimens previously identified as P. dolichorhiza in Asia and Australasia (including Papua New Guinea) represent distinct species (Magain et al 2017a, b). Within the P. serusiauxii clade, the specimen from Borneo is sister to a strongly supported group composed of all specimens from Papua New Guinea. In the rbcLX Nostoc tree (Fig. S1), all P. serusiauxii symbionts, including the newly sequenced cyanobiont from the Malaysian specimen, belong to a strongly supported clade (Fig. 1B), which corresponds to phylogroup IX sensu Magain et al (2017a).
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