Modicella guangxiensis (Mortierellomycota, Mortierellaceae), a new species from south-western karst areas of China

Modicella Kanouse (1936) is the only genus of Mortierellaceae known to produce macroscopic fruiting bodies in the form of small, whitish, round sporocarps. Specimens which belong to Modicella were collected during our field investigations in tropical karst areas of China. Based on morphological characteristics and phylogenetic analysis, a new species is introduced.Modicella guangxiensis is described as a new species from tropical karst areas of China. The main distinguishing characteristics of M. guangxiensis are the number of sporangiospores per sporangium (11–18), the size of sporangiospores (14–34 × 12–27.5 μm) and the surface of some hyphae with hemispherical tuber. The phylogenetic analyses, based on the internal transcribed spacer (ITS) and the large subunit (LSU) regions of rDNA sequences using Bayesian (BA) and Maximum Likelihood (ML) methods showed that the new taxon is closely related to M. reniformis.

Modicella Kanouse (1936) 为 Mortierellaceae 科中唯一已知能产生宏观繁殖体的属，其繁殖体呈小型、乳白色、圆形的孢子囊。在对中国热带喀斯特地区的实地调查中，我们收集了属于 Modicella 的标本。基于形态特征和系统发育分析，我们引入了一种新物种。Modicella guangxiensis 被描述为来自中国热带喀斯特地区的新物种。M. guangxiensis 的主要鉴别特征包括每个孢子囊中孢子囊孢子的数量（11–18）、孢子囊孢子的尺寸（14–34 × 12–27.5 微米）以及某些菌丝表面具有半球形块茎。基于 rDNA 序列的内转录间隔区（ITS）和大型亚单位（LSU）区域，运用贝叶斯（BA）和最大似然（ML）方法进行的系统发育分析表明，该新分类群与 M. reniformis 密切相关。