Venturia chinensis sp. nov., a new venturialean ascomycete from Khingan Mountains

Abstract

A new species of Venturia (V. chinensis) is described and illustrated from the leaves of Lonicera praeflorens collected from Lesser Khingan Mountains, the northeast China. It is characterized by habitat saprobic; ascomata small-sized, solitary or scattered, superficial, subglobose to citriform, wall black, papillate, ostiolate, covered with setae; peridium thin; hamathecium evanescent in mature ascomata; asci 8-spored, bitunicate, fissitunicate, oblong to obclavate, with or without a short, knob-like pedicel; ascospores ellipsoidal, olivaceous pale brown, 1-septate, ascospore wall thin, smooth. Comparisons of V. chinensis with V. lonicerae (another species on Lonicera caerulea) and other species of Venturia lead to the conclusion that collected taxon is new. Its relationships with other species of Venturia are discussed based on morphology and 28S nrDNA and ITS nrDNA sequence comparisons.

Genera of phytopathogenic fungi: GOPHY 1

“…2003 (morphology of asexual stage); Crous et al., 2007d, Zhang et al., 2011, Zhang et al., 2016 (morphology and phylogeny).…”

Venturiales

“…Morphologically, the circumscription of Venturia s. str. has been summarised as follows: 1) ascomata, erumpent, semi-erumpent, or superficial, rarely immersed, scattered or gregarious, often with papillate ostiole, mostly with setae; 2) hamathecium narrowly cellular, hyaline, usually evanescent in mature ascomata; 3) asci 8-spored, bitunicate, broadly cylindrical to obclavate, usually lacking a pedicel; 4) ascospores pale greenish olivaceous to dark brown, 1-septate, usually asymmetrical ( Zhang et al., 2016a , Zhang et al., 2016b ). Based on the circumscription above, type specimens of six species of Venturia , V .…”

“…rhamni were revised, redescribed and illustrated, and V . corni was excluded from Venturia ( Zhang et al., 2016a , Zhang et al., 2016b ). Fungarium specimens of 59 species of Venturia are described and illustrated in the present study, with 22 species being excluded from Venturia (see below).…”

“…rhamni , which have semi-immersed ascomata lacking setae, and ascospores with a septum in the lower half. The small-sized ascomata (40–60 μm) of V. muelleri ( Zhang et al., 2016a , Zhang et al., 2016b ), however, are distinguishable from the other three species. The asci and ascospores of V. rumicis are longer and wider than V .…”

“…maculiformis , and asci of V. rhamni are also longer than those of V . maculiformis ( Zhang et al., 2016a , Zhang et al., 2016b ).…”