Evolutionary relationships of Heimioporus and Boletellus (Boletales), with an emphasis on Australian taxa including new species and new combinations in Aureoboletus, Hemileccinum and Xerocomus

Abstract

Boletellus and Heimioporus, two genera of Boletaceae with ornamented basidiospores, are shown to be distinct genera on the basis of phylogenetic analyses of nuclear ribosomal large-subunit and translation elongation-factor 1a DNA sequences. Comparison of spore ornamentation type -longitudinally ribbed in Boletellus v. punctate, alveolatereticulate in Heimioporus -are further evidence for distinction. Analyses of multiple accessions from the Americas, Asia and Australia support the monophyly of Heimioporus and a 'core Boletellus' clade, containing the type species, B. ananas (M.A.Curt.) Murrill, and approximately seven additional species. Tests of alternative phylogenetic topologies could not reject monophyly of a more inclusive group containing the core Boletellus clade and six other species.

Studies on Boletellus sect. Boletellus in Brazil and Guyana

“…Young from Australia, Malaysia and Singapore from also share in lack of reddish tons. However it differs in the lacking scales, on which it is matted subtomentose breacking in felt like patches and rare brown low squamules, but it is not truly squamose or squamulose (Halling et al 2015).…”

“…Notes -Boletellus cremeovelosus, due its dry squamose pileus with appendiculate margin and basidiospores >16 µm long longitudinally ribbed is placed in the sect. Boletellus (Singer 1986, Halling et al 2015. Among taxa of this group, Halling et al (2015) used successfully the features of the scales on pileus surface for species concept.…”

“…Boletellus (Singer 1986, Halling et al 2015. Among taxa of this group, Halling et al (2015) used successfully the features of the scales on pileus surface for species concept. Following this concept, our new species is well characterized by the complete lack of pink, red, lavender or purple tints on the basidiome and the fluffy/soft squamules pileus, on which they are more or less pyramidal/erect at centre then turning more flattened toward margin.…”

“…Curtis) Murrill from Florida to Colombia differs in the appressed to recurved squamules and more squarrose at centre (Singer 1945, Thiers 1963, Singer 1970, Singer et al 1992, Ortiz-Santana et al 2007, Mayor et al 2008; B. ananiceps (Berk.) Singer has squamules confined to a portion that is beneath an overlying of fine superficial layer of hyphae that gains the paler red to pink color (Halling et al 2015); B. deceptivus Halling & Fechner is coarsely squamose that are deep red with whitish or paler ochraceous tips; and B. emodensis (Berk.) Singer presents fine scales from the beginning (Halling et al 2015).…”

“…Singer has squamules confined to a portion that is beneath an overlying of fine superficial layer of hyphae that gains the paler red to pink color (Halling et al 2015); B. deceptivus Halling & Fechner is coarsely squamose that are deep red with whitish or paler ochraceous tips; and B. emodensis (Berk.) Singer presents fine scales from the beginning (Halling et al 2015). Sato & Hattori (2015) also presented a species concept for this group that also described reddish taxa.…”