Petchiella hymenopterorum

Petchiella, (syn. Petchia) a genus introduced by Thanakitpipattana et al. (2020), currently comprises two recognized species: P. siamensis and P. mantidicola, as listed on Mycobank (www.mycobank.org, accessed 28 Febuary 2025). These species were originally described from Thailand and Japan, respectively, and are found on the oothecae of praying mantids (Mantidae). Both P. siamensis and P. mantidicola produce cream, terminal, obovoid perithecial heads. In contrast, P. hymenopterorum, which occurs on hymenopteran pupal nests, produces slightly flattened perithecial heads. The ascospores of P. hymenopterorum and P. siamensis remain whole, whereas those of P. mantidicola disarticulate into part-spores (Kobayasi & Shimizu 1983). Additionally, the arrangement of perithecia in P. hymenopterorum is oblique, differing from the ordinal arrangement observed in P. siamensis and P. mantidicola. On PDA, conidia and reproductive structures in P. hymenopterorum are produced sparingly