Duosporium is a monotypic genus including only the type species Duosporium yamadanum which has been treated in the literature as “anamorphic Pezizomycotina.” Nevertheless, this is just a conjecture since its true phylogenetic affinities remain unknown. This fungus is known to cause leaf spots on several members of Cyperus spp. It has been intensively investigated in the 1990s as a potential candidate for use as an inundative biocontrol agent against purple nutsedge—a major tropical weed. Its morphology was recognized, as somewhat close to those of Curvularia and Bipolaris. Nevertheless, it was kept in a separate genus based on two distinctive morphological features: production of two kinds of spores (as indicated by its generic name) and straight versicolored macroconidia. No molecular studies have ever been made to elucidate the placement of Duosporium. In a relatively recent publication, Curvularia americana and C. chlamydospora were found to produce macro- and microconidia, as in Duosporium. Besides, there are several species of Curvularia known to have predominantly straight conidia. Here, a multilocus phylogenetic analysis including the internal transcribed spacer regions and intervening 5.8S nrRNA gene (ITS) and translation elongation factor 1-α (TEF1) sequences placed D. yamadanum within Curvularia, close to C. tuberculata, C. oryzae, and C. reesi. This led to the proposal of the new combination C. yamadana and the synonymization of Duosporium with Curvularia.

中文翻译：

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揭穿Duosporium

Duosporium是一个单型属，仅包括山形Duosporium yamadanum类型的种，在文献中已将其称为“变形Pezizomycotina”。然而，这只是一个推测，因为其真正的系统发生亲和力仍然未知。已知这种真菌会在莎草属的几个成员上引起叶斑。在1990年代，它已被广泛研究用作潜在的候选物，以作为一种紫色的热带植物（一种主要的杂草）的泛滥生物防治剂。其形态被确认，因为有些接近于的弯孢和蠕。尽管如此，它还是基于两个独特的形态特征被保存在一个单独的属中：产生两种孢子（如其通用名称所示）和纯正的杂色大分生孢子。尚未进行分子研究来阐明Duosporium的位置。在一个相对较新的出版物中，与Duosporium一样，发现了Curvularia americana和C. chlamydospora产生大分生孢子和微分生孢子。此外，已知有几种弯孢菌主要为直生分生孢子。在此，进行了一个多基因座系统发育分析，包括内部转录的间隔区和介入的5.8S nrRNA基因（ITS）和翻译延伸因子1-α（TEF1）序列置于D. yamadanum内弯孢，靠近C. tuberculata，C.米曲霉，和C. reesi。这导致提出了新的山dC。yamadaana组合的提议，以及Duosporium与Curvularia的同义词。