Abstract
Recent collections and herbarium specimens of Rugonectria and Thelonectria from different regions of China were examined. Using combined analyses of morphological and molecular data, 17 species are recognised including three species of Rugonectria and 14 species in Thelonectria. Amongst them, R.microconidia and T.guangdongensis are new to science. Rugonectriamicroconidia on mossy bark is characterised by superficial, yellow to orange, pyriform to subglobose perithecia with a warted surface; ellipsoidal to broadly ellipsoidal, striate, uniseptate ascospores; and allantoid to rod-shaped, aseptate microconidia. Thelonectriaguangdongensis possesses bright red perithecia with a slightly roughened surface and a prominently dark papilla; ellipsoidal, smooth, uniseptate ascospores; and subcylindrical, slightly curved, multiseptate macroconidia. Morphological distinctions and sequence divergences between the new species and their close relatives are discussed. Name changes for the previously recorded species in China are noted.
Highlights
The family Nectriaceae was introduced in 1865 and circumscribed to accommodate the hypocrealean species having ascomata that are generally yellow, orange-red to purple and usually changing colour in potassium hydroxide (KOH) and lactic acid (LA) (Rossman et al 1999)
The isolate Herbarium Mycologicum Academiae Sinicae (HMAS) 254521 grouped with other members of Rugonectria by receiving high bootstrap values (MLBP/Maximum Parsimony bootstrap proportion (MPBP)/Bayesian Inference posterior probability (BIPP) = 100%/100%/100%) and the isolate HMAS 254522 clustered with the representatives of Thelonectria (MLBP/MPBP/BIPP = 100%/100%/100%), which support the taxonomic placements of these new species
The genus Rugonectria is characterised by the non-papillate, orange to red, conspicuously warted to rugose perithecial surface (Chaverri et al 2011)
Summary
The family Nectriaceae was introduced in 1865 and circumscribed to accommodate the hypocrealean species having ascomata that are generally yellow, orange-red to purple and usually changing colour in potassium hydroxide (KOH) and lactic acid (LA) (Rossman et al 1999). About 55 genera containing 900 species are included in the family (Lombard et al 2015). A phylogenetic backbone for Nectriaceae was constructed based on DNA sequences of 10 loci by Lombard et al (2015). Zhao-Qing Zeng & Wen-Ying Zhuang / MycoKeys 55: 101–120 (2019)
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