On Sistotremastrum and similar-looking taxa (Trechisporales, Basidiomycota)

The taxonomy of Sistotremastrum (Trechisporales, Basidiomycota) is revised based on morphology and DNA data. The genus is shown to be polyphyletic, and therefore it is split into two units-Sistotremastrum s. str. and Sertulicium, gen. nov. (typified with Corticium niveocremeum). Sistotremastrum s. str. is retained for eleven species of which eight are described as new while Sertulicium encompasses at least six species, including one new to science. Both of these genera are only distantly related to other representatives of the Trechisporales. Additionally, a new poroid neotropical species, Porpomyces abiens (Hydnodontaceae), is described as morphologically similar to some members of Sistotremastrum s. str.

Automated summary

The taxonomy of Sistotremastrum (Trechisporales, Basidiomycota) has been revised based on morphology and DNA data, resulting in the split of the genus into Sistotremastrum s. str. and Sertulicium. The former retains eleven species, eight of which are new, while the latter encompasses at least six species, including one new to science. These two genera are distantly related to other representatives of the Trechisporales, and a new poroid neotropical species, Porpomyces abiens, has been described with morphological similarity to some members of Sistotremastrum s. str.