Abstract
As a result of an ongoing research survey of microfungi in Yunnan, China, several saprobic ascomycetes were collected from various host substrates. Preliminary morphological analyses identified a few of these taxa as
species. We obtained DNA sequence data of the
species from pure cultures and investigated their phylogenetic affinities. Phylogenetic analyses of a combined LSU, ITS, SSU and
sequence dataset demonstrated that five isolates of
formed well-resolved subclades within Periconiaceae. Accordingly, three new
species are introduced viz.
,
and
, and new host and geographical records of
and
, are also reported from dead branches of
and
.
formed a monophyletic clade with
in the present phylogenetic analyses. Results of the pairwise homoplasy index (PHI) test indicated significant recombination between
and
. Therefore,
has been synonymized under
. In addition, we re-illustrated and studied the type specimen of the sexual genus
. As a type species of
,
features similar morphology to the sexual morph of
and
. We therefore synonymize
under
based on morphological and phylogenetic evidence. Furthermore, our new isolates produced brown conidia of asexual morph in agar media typical of the genus
. Based on morphological comparison with
in vitro and phylogenetic status of
, we also treat
as a synonym of
. Detailed descriptions and illustrations of three novel taxa and two new records of
and
as well as the illustration of
comb. nov. are provided. An updated phylogenetic tree of Periconiaceae using maximum likelihood and Bayesian inference analyses is constructed. Generic circumscription of
is amended.