Abstract：
Xenodidymella species have a wide range of hosts and can be found as pathogens and saprobes. In this study, two new species of Xenodidymella were found from leaf diseases of three pasture-medicinal plants in Ilam Province, in the west of Iran, and proposed here as X. ilamica and X. scandicis spp. nov. These species were identified based on morphological features and phylogenetic analyses of the internal transcribed spacer regions 1 & 2 and 5.8S nrDNA (ITS), partial beta-tubulin gene (tub2), and partial RNA polymerase II second largest subunit (rpb2) gene. The four Xenodidymella strains isolated in this study were delimited into two sister clades, with the two isolates of X. ilamica from the leaf spot of Colchicum speciosum and Ficaria kochii and two isolates of X. scandicis from leaf blight of Scandix pecten-veneris. Morphologically, X. scandicis produces larger, ostiolate or poroid pycnidia in vitro, while pycnidia in the cultures of X. ilamica are non-ostiolate and smaller. Some pycnidia in old cultures of X. scandicis produce a neck, but a distinct neck in X. ilamica has not been observed. Moreover, three plants under study are new hosts for the genus Xenodidymella.
摘要：
异种菌种具有广泛的宿主，可以作为病原体和细菌被发现。在这项研究中,从伊兰省三种牧场药用植物的叶病中发现了两种新的Xenodymella，在伊朗西部，并在此提议为X.ilamica和X.scanicisspp。11月。根据内部转录间隔区1＆2和5.8SnrDNA（ITS）的形态特征和系统发育分析鉴定了这些物种，部分β-微管蛋白基因（tub2），和部分RNA聚合酶II第二大亚基(rpb2)基因。在这项研究中分离出的四种Xenodymella菌株被划分为两个姐妹进化枝，X.伊拉米卡的两个分离株来自秋葵叶斑病和小花Ficariakochii的叶斑病，X.scricis的两个分离株来自Scandix果胶-veneris的叶枯病。形态学上,X.丑闻产生更大的，卵形或多孔体在体外，而X.ilamica的培养物中的pycnidia是非卵形且较小。X.Scandicis古老文化中的一些比尼迪亚产生脖子，但是在伊拉米卡没有观察到明显的脖子。此外，正在研究的三种植物是Xenodidymella属的新宿主。
