The diversity and functionality of ericoid mycorrhizal (ErM) fungi are still being understudied. Members of Chaetothyriomycetidae evolved a specific lifestyle of inhabiting extreme, poor, or toxic environments. Some taxa in this subclass, especially in Chaetothyriales, are also putative ErM taxa, but their mycorrhizal ability is mostly unknown because the members are generally hard to isolate from roots. This study herein focused on eight root isolates and provided their phylogeny and morphology of root colonization. Phylogenetic analysis based on rRNA sequences clarified that the isolated strains were not classified into Chaetothyriales, but in an unnamed lineage in Chaetothyriomycetidae. This lineage also contains rock isolates, bryosymbionts, and a resinicolous species as well as various environmental sequences obtained from soil/root samples. All strains grew extremely slow by mycelia on cornmeal or malt extract agar (2.9–8.5 mm/month) and formed hyphal coils in vital rhizodermal cells of sterile blueberry seedlings in vitro. This study illustrated the presence of a novel putative ErM lineage in Chaetothyriomycetidae.

石蜡菌根 (ErM) 真菌的多样性和功能性仍在研究中。Chaetothyriomycetidae 的成员进化出一种特殊的生活方式，即居住在极端、贫穷或有毒的环境中。该亚类中的一些分类群，尤其是毛壳菌目，也是推定的 ErM 分类群，但它们的菌根能力大多是未知的，因为这些成员通常很难从根中分离出来。本研究集中于八种根分离物，并提供了它们的系统发育和根定殖形态。基于 rRNA 序列的系统发育分析表明，分离的菌株没有被分类为毛壳菌目，而是在毛壳菌科的一个未命名的谱系中。该谱系还包含岩石分离物、苔藓共生体和树脂物种以及从土壤/根样本中获得的各种环境序列。体外。这项研究说明了在毛壳菌科中存在一种新的推定 ErM 谱系。