Fungalpedia – Note 3093, Pseudoachroiostachys

 

Pseudoachroiostachys Tibpromma & K.D. Hyde, in Tibpromma et al., Fungal Divers. 92: 107 (2018).

Citation when using this data: Perera RH et al. 2023 – Fungalpedia.

Index Fungorum, Facesoffungi, MycoBank, GenBank.

Classification: Nectriaceae, Hypocreales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi.

Saprobic on dead or decaying leaves of Pandanus sp. in terrestrial habitats. Mycelium superficial on the host, hyaline, rough, unbranched, septate, pale orange. Sexual morph: Undetermined. Asexual morph Hyphomycetous. Conidiophores macronematous, mononematous, unbranched, erect, straight, multi-septate, becoming thick-walled towards the base, hyaline and glassy. Conidiogenous cells terminal, phialidic, held in a whorl of 5–6, cylindrical, narrowing to a short neck, hyaline, smooth-walled. Conidia ovoid, aseptate, apex rounded, sometimes flattened in one side, smooth, hyaline to subhyaline, occur in slimy masses, with or without mucoid sheath (adapted from Tibpromma et al. 2018).

Known distribution: Thailand (Tibpromma et al. 2018)

Notes: Tibpromma et al. (2018) established the monospecific asexual genus Pseudoachroiostachys associated with Pandanus sp. Pseudoachroiostachys has similar asexual morph and colony morphology with Achroiostachys aurantispora in Stachybotryaceae (Hypocreales) (Lombard et al. 2016; Tibpromma et al. 2018). Current phylogenetic analysis confirmed the placement of Pseudoachroiostachys in Nectriaceae (Perera RH et al. 2023). Pseudoachroiostachys showed close phylogenetic affinities to Pandanaceomyces (Perera RH et al. 2023).

Type species: Pseudoachroiostachys krabiensis Tibpromma & K.D. Hyde [as ‘krabiense‘], in Tibpromma et al., Fungal Divers. 92: 107 (2018).

Other accepted species: Species Fungorum – search Pseudoachroiostachys.

 

References

Lombard L, Houbraken J, Decock C et al. 2016 — Generic hyper-diversity in Stachybotriaceae. Persoonia 36:156–246.

Perera, R.H., Hyde, K.D., Jones, E.B.G. et al. 2023 — Profile of Bionectriaceae, Calcarisporiaceae, Hypocreaceae, Nectriaceae, Tilachlidiaceae, Ijuhyaceae fam. nov., Stromatonectriaceae fam. nov. and Xanthonectriaceae fam. nov. Fungal Diversity 118, 95–271.

Tibpromma S, Hyde KD, McKenzie EH et al. 2018 — Fungal diversity notes 840–928: micro-fungi associated with Pandanaceae. Fungal Divers 93:1–60.

 

Entry by

Perera RH, Guizhou Key Laboratory of Agricultural Biotechnology, Guizhou Academy of Agricultural Sciences, Guiyang, Guizhou 550006, P. R. China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand, Mushroom Research Foundation, 128 M.3 Ban Pa Deng T. Pa Pae, A. Mae Taeng, Chiang Mai 50150, Thailand.

 

Published online 4 September 2026.

 

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