Seven new Serendipita species associated with Australian terrestrial orchids

Serendipita is one of the main fungal genera that form mutualistic associations with species of orchids (Orchidaceae). Seven new Serendipita species associated with various Australian orchid genera are described. These Serendipita species were originally characterized by multilocus DNA sequence species delimitation analyses (three mtDNA and four nuclear genes) and confirmed as distinct with addition of further isolates and re-analysis of the nuc rDNA ITS1-5.8S-ITS2 (ITS) and nuc 28s rDNA (28S). Morphology and micro-features of cultures of each of the species are described. Three of the new species are binucleate, whereas the other four are multinucleate. For the ITS region, the seven species have within species sequence divergence between 1.07 and 4.31 % and all but one of the species pairs are separated by interspecific divergence of at least 4.35 %. The newly described Serendipita species, S. australiana, S. communis, S. occidentalis, S. rarihospitum, S. secunda, S. talbotii, and S. w...

西伦蒂普蒂菌属（Serendipita）是与兰科（Orchidaceae）物种形成互利共生关系的主要真菌属类群之一。本研究记述了7个与多种澳大利亚产兰科植物属共生的西伦蒂普蒂菌新物种。这些西伦蒂普蒂菌物种最初通过多位点DNA序列物种界定分析（包含3个线粒体DNA（mtDNA）位点与4个核基因位点）进行特征描述，后续通过补充更多分离菌株并重新分析核核糖体DNA ITS1-5.8S-ITS2区（ITS）与核28S核糖体DNA（28S）序列，确认其为独立物种。本研究同时记述了各物种培养物的形态学与微观特征。其中3个新物种为双核菌丝体，剩余4个为多核菌丝体。在ITS序列区域中，7个物种的种内序列分歧度介于1.07%至4.31%之间；除1个物种对外，其余所有物种对的种间分歧度均不低于4.35%。本次新记述的西伦蒂普蒂菌物种包括：澳洲西伦蒂普蒂菌（S. australiana）、普通西伦蒂普蒂菌（S. communis）、西方西伦蒂普蒂菌（S. occidentalis）、稀宿主西伦蒂普蒂菌（S. rarihospitum）、第二西伦蒂普蒂菌（S. secunda）、塔尔博特西伦蒂普蒂菌（S. talbotii）以及S. w……