Dendryphiella fasciculata sp. nov. and notes on other Dendryphiella species

Abstract

Dendryphiella is an asexual morph genus placed in the family Dictyosporiaceae. During our study on brown-spored hyphomycetes, a new taxon D. fasciculata was found on decaying wood collected in Chiang Mai Province, Thailand. The new species is characterized by mononematous, fasciculate conidiophores with polytretic, terminal and intercalary conidiogenous cells. Conidia are fusiform to ellipsoidal, pale brown and aseptate when young, becoming brown or dark brown, verrucose and 3-septate when mature. The phylogenetic analysis of combined ITS and LSU sequence data showed that isolates of Dendryphiella form a well-supported clade in Dictyosporiaceae, and Dendryphiella fasciculata is phylogenetically distinct from other species. Dendryphiella fasciculata is therefore introduced here with a description and morphological illustrations. Taxonomic notes and a key to Dendryphiella species are provided.

Neodendryphiella, a novel genus of the Dictyosporiaceae (Pleosporales)

“…Regarding the five Dendryphiella strains included in this study, only three (CBS 118716, CBS 121797 and CBS 854.96) nested in the well-supported clade of Dendryphiella and none of them matched sequences representative of the type species of the genus D.vinosa (DQ 307316.1, EU848590.1 and NBRC-03266901) and used previously by other authors to establish the relationship of D.vinosa with the Dictyosporiaceae (Gareth Jones et al 2008, Crous et al 2014, 2016, Tanaka et al 2015, Boonmee et al 2016, Liu et al 2017). The strains CBS 118716 and CBS 121797 matched the ex-type strain of D.paravinosa (CBS 141286); while CBS 584.96 nested in a terminal subclade with D.fasciculata and D.paravinosa , but it was placed in a single branch representative of a distinct taxa (Fig.…”

“…1). Its genetic difference and the production of conidia with up to 7 septa, a distinct morphological feature with respect to the accepted species of Dendryphiella (Liu et al 2017, Hyde et al. 2018), justify the proposal of a new species in this genus.…”

“…Dendryphiellauniseptata is only known from the type material, which was collected in Honiara (Japan) and no ex-type culture was preserved. This species was considered a synonym of D.infuscans by Matsushima (1975) but not accepted by Liu et al (2017).…”

“…The genus is characterised by pigmented conidiophores, with terminal or intercalary polytretic conidiogenous cells, with dark scarring on the nodose swellings, producing acropleurogenous, solitary or catenate conidia, which are commonly multi-septate and cylindrical with rounded ends (Ellis 1971). Although Index Fungorum and MycoBank list 17 taxa in Dendryphiella , a recent review of literature reported only 12 species are accepted, including the newly proposed D.fasciculata (Liu et al 2017). Dendryphiellapitsanulokensis is the latter species added to the genus (Hyde et al 2018).…”

“…However, DNA sequence data for Dendryphiella species is very limited to create a robust taxonomy for the genus. Only LSU and/or ITS sequences of D.eucalyptorum , D.fasciculata , D.paravinosa , D.pitsanulokensis and D.vinosa are available (Crous et al 2014, 2016, Liu et al 2017, Hyde et al 2018). In addition, with the exception of the first four mentioned, there is no ex-type culture of other species of this genus and only reference strains of D.vinosa and D.infuscans are available in public collections for comparison.…”