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).

Theissenia reconsidered, including molecular phylogeny of the type species T. pyrenocrata and a new genus Durotheca (Xylariaceae, Ascomycota)

“…Two species ancestral to Xylariales , Cryphonectria macrospora and Amphilogia , were used as outgroup taxa. All 17 strains were sequenced for the α-actin and the β-tubulin gene (Table 1) for comparison with the data in Ju et al . (2007).…”

“…Notes : Durotheca rogersii is placed here based on the description and molecular data provided by Ju et al (2007), which leave no doubt on the affinities of this species to Durotheca .…”

Fungal diversity notes 253–366: taxonomic and phylogenetic contributions to fungal taxa

“…They differ in the shape of stromata and ascospore shape and size. Durotheca rogersii has a widely effused-pulvinate 2.5 mm thick stroma(Ju et al 2007), while that of D. macrostroma is very thick (10 mm) and subglobose. Ascospores of D. rogersii have very thick walls(3-4.5 µm) and are larger (25-36 × 19-24 µm) than D. macrostroma, but all lack a germ slit.…”

Multigene phylogenetic and population differentiation data confirm the existence of a cryptic species within Chrysoporthe cubensis

“…The alignments were amended with ACT, β-tubulin and ITS sequences from the NCBI (National Center for Biotechnology Information, http://www.ncbi.nlm.nih.gov) nucleotide database for a closely related taxon, Amphilogia gyrosa, to serve as outgroup (Ju et al 2007). The incongruence length difference (ILD) test (Farris et al 1995;Cunningham 1997) implemented in PAUP* 4.0b10 (Swofford 2002), was used to test whether the resulting alignments represent homogenous partitions.…”