Molecular and morphological studies on the subantarctic genus Orceolina (Agyriaceae)

Abstract

The subantarctic genus Orceolina is revised and two species are accepted, i.e. Orceolina antarctica Mull. Arg. R. S. Poulsen Søchting comb. nov. and Orceolina kerguelensis (Tuck.) Hertel. Descriptions of the species are provided. In addition the phylogeny of the genus Orceolina and allied taxa was investigated using nucleotide sequences of the LSU rRNA gene. Sequences from these regions of nine agyrialean fungi were aligned to those of four representatives of Pertusariales used as outgroup. The alignment was analysed cladistically using maximum parsimony. The two Orceolina clustered together within the Agyriaceae. The placement in the family is supported by high bootstrap values and the Kishino-Hasegawa test.

Escape from the cryptic species trap: lichen evolution on both sides of a cyanobacterial acquisition event

“…Increasing taxon sampling has provided continuously improving resolution of the nature of evolution in this group, from reciprocal monophyly with Trapelia in single‐ or three‐locus gene phylogenies (Poulsen et al . ; Schmitt et al . ) to a paraphyletic Trapelia – Placopsis phylogeny in an eight‐locus sample with more species (Resl et al .…”

“…distributed in temperate parts of both hemispheres, and an estimated 62 species in the cyanobacteria-associated Placopsis clades mostly in cold, high-latitude regions, many restricted to New Zealand and the Subantarctic (Lamb 1947). Increasing taxon sampling has provided continuously improving resolution of the nature of evolution in this group, from reciprocal monophyly with Trapelia in single-or three-locus gene phylogenies (Poulsen et al 2001;Schmitt et al 2003) to a paraphyletic Trapelia-Placopsis phylogeny in an eight-locus sample with more species . For our present study, the largest to date for this group, we included more than five times as many Placopsis vouchers as Resl et al (2015) with the aim to provide a morphometric analysis of thallus and apothecial size metrics both within and among multiple species with every morphometric voucher anchored in an eight-locus phylogeny.…”

Coccomyxa antarctica sp. nov. from the Antarctic lichen Usnea aurantiacoatra

“…Furthermore, species of Coccomyxa have been reported as photobionts of lichen genera Baeomyces , Dibaeis , Icmadophila , Lichenomphalia , Micarea , Multiclavula , Nephroma , Orceolina , Peltigera , Placynthiella , and Solorina in earlier studies ( Poulsen et al 2001 , Smith et al 2009 , Wirth et al 2013 , Gustavs et al 2017 ), but not Usnea . The authors’ earlier studies also revealed that the photosynthetic partner of the Antarctic lichen U.…”

Coccomyxa greatwallensis sp. nov. (Trebouxiophyceae, Chlorophyta), a lichen epiphytic alga from Fildes Peninsula, Antarctica

“…), Agaricales ( Lichenomphalia Redhead, Lutzoni, Moncalvo & Vilgalys), Lecanorales ( Micarea Fr.) and Cantharellales ( Multiclavula R.H. Petersen) ( Poulsen et al 2001 ; Smith et al 2009 ; Wirth et al 2013 ), as well as the basidiomycots belonging to Agaricales ( Omphalina Quél.) ( Jaag 1933 ; Zoller and Lutzoni 2003 ).…”