Abstract
During our ongoing surveys of fungi on submerged wood in the Greater Mekong Subregion, we collected two new species similar to
Bactrodesmium longisporum
.
Pseudobactrodesmium
gen. nov. is introduced to accommodate the new species,
P. aquaticum
,
P. chiangmaiensis
and
B. longisporum
is transferred to this genus. Fasciculate conidiophores, enteroblastic conidiogenous cells and subulate to fusiform, phragmoseptate conidia with a tapering apical cell and sheath characterize the genus.
Pseudobactrodesmium aquaticum
has longer conidia than
P. chiangmaiensis
. The placement of
Pseudobactrodesmium
in
Dactylosporaceae
(Eurotiomycetes) is a novel finding based on analyses of combined LSU, SSU, ITS and RPB2 sequence data. Our study reveals that
Pseudobactrodesmium
is likely to be a speciose genus with different species in streams around the world.