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The family
Cucurbitariaceae
is rich in species diversity and has a wide host range and geographic distribution. In this study, we identified 12
Cucurbitariaceae
isolates which were obtained from disease symptoms in two forest trees in Khuzestan province, Iran. In addition, this family is reassessed using phylogenetic analyses based on DNA sequences from five nuclear regions (ITS, LSU,
TUB2
,
TEF1α
, and
RPB2
). The phylogenetic analyses showed that the present isolates represent one new genus,
Nothocucurbitaria
, and three new species,
Allocucurbitaria galinsogisoli
,
Nothocucurbitaria izehica
, and
Parafenestella quercicola
, which are described and illustrated. Furthermore, the genus
Allocucurbitaria
is emended to accommodate
Seltsamia ulmi
that grouped with the type species of
Allocucurbitaria
.
Parafenestella pittospori
and
A. prunicola
are recombined into the genera
Neocucurbitaria
and
Nothocucurbitaria
, respectively. Comparative analysis of single-locus trees revealed that the
TUB2
and
TEF1α
can distinguish most genera and species in
Cucurbitariaceae
, while the ITS and LSU phylogenies show low resolution at both generic and species level. The best single-locus marker,
RPB2
, was able to distinguish all generic and most species lineages in
Cucurbitariaceae
.