Macroidriella Z. X. Zhang, J. W. Xia & X. G. Zhang, 2024

Zhang, Zhao-Xue, Shang, Yu-Xin, Zhang, Meng-Yuan, Zhang, Jin-Jia, Geng, Yun, Xia, Ji-Wen & Zhang, Xiu-Guo, 2024, Phylogenomics, taxonomy and morphological characters of the Microdochiaceae (Xylariales, Sordariomycetes), MycoKeys 106, pp. 303-325 : 303-325

Macroidriella Z. X. Zhang, J. W. Xia & X. G. Zhang gen. nov.

Type species.

Macroidriella bambusae Z. X. Zhang, J. W. Xia & X. G. Zhang.

Etymology.

Referring to the composed of “ Macro- ” and “ - idriella ” (Similar in morphology to Idriella and bigger than Idriella in conidia).

Description.

Genus of Microdochiaceae . Endogenic on diseased leaves of Bambusaceae sp. Sporodochia yellowish brown, slimy. Conidiophores are indistinct and often reduced to conidiogenous cells. Conidiogenous cells are straight or slightly branched, smooth, curved, mono- or polyblastic, terminal, hyaline, septate, cylindrical and ampulliform. Conidia are solitary, hyaline, lunate, curved, mooned, multi-guttulate, apex rounded, base usually flattened. Sexual morphs were not observed, chlamydospores were not observed.

Notes.

In the phylogenetic tree (Fig. 1 ), Macroidriella is allied to Idriella , Microdochium and Selenodriella , but forms a separate lineage with good statistical support (98 % MLBV and 1.0 BIPP). In morphology, the conidia of Macroidriella are predominantly lunate and curved, unlike the elliptical conidia of Microdocium, suggesting a genus of its own, because it is similar to Idriella in morphology (but the conidia of Macroidriella are longer than Idriella ), both being lunate conidia, it is named Macroidriella gen. nov.

Figures

Figure 1. A maximum likelihood tree was constructed using a combined dataset of ITS, LSU, RPB 2, and TUB 2 sequence data. Branch support values, shown as ML / BIPP, are indicated above the nodes: MLBV ≥ 70 % on the left and BIPP ≥ 0.90 on the right. Ex-type cultures are denoted in bold and marked with an asterisk (*). Strains from the current study are highlighted in red. The tree was rooted with Cryptostroma corticale (CBS 218.52). The scale bar at the bottom center represents 0.05 substitutions per site.