Theissenia rogersii sp. nov. and phylogenetic position of Theissenia

Abstract

Theissenia rogersii deviates from known Theissenia species primarily in having large ascospores with a thick wall layer and a unique configuration of two stromatal tissue types, one carbonaceous and the other fibrous. The carbonaceous tissue forms palisades on and beneath the perithecial layer as well as encasing individual perithecia, whereas the fibrous tissue fills the spaces between columns of the palisades as well as between encased perithecia. Phylogenetic analyses based on DNA sequences of beta-tubulin and alpha-actin genes placed Theissenia in the subfamily Hypoxyloideae among the genera that are characterized by having bipartite stromata (i.e. with the stromata differentiated into an outer dehiscing layer and an inner perithecium-bearing layer).

The phylogenetic position of Obolarina dryophila (Xylariales)

“…Obolarina lacks a iodine-positive apical ring; however, thin ring-like iodinenegative structures observed by Nordén and Sunhede (2001) in some of the asci may represent the reduced discoid rings of Biscogniauxia. Only a bipartite stroma and short-stiped to sessile asci remain as the morphological characteristics common to these three genera, together with the more distantly related Whalleya and Theissenia (Ju et al 2007).…”

Multi-gene phylogenetic and taxonomic contributions to Xylaria (Ascomycota) associated with fallen fruits from China

“…The generic concept of Xylaria was traditionally based on morphological studies ( Dennis 1957 , 1958 ; Rogers et al 1987 , 1988 ; San Martín and Rogers 1989 ; Fournier 2014 ; Fournier et al 2020 ). In the past two to three decades, molecular phylogenetic analysis was carried out on the family Xylariaceae by using a single-gene to multi-gene ( Lee et al 2000 ; Bahl et al 2005 ; Ju et al 2004 , 2007 ; Peláez et al 2008 ; Hsieh et al 2010 ; Læssøe et al 2013 ; Wangsawat et al 2021 ). Nuclear ribosomal DNA, ITS -5.8S, and protein-coding gene are commonly used for inferring phylogenetic relationships ( Tang et al 2009 ; Visser et al 2009 ).…”