Fungalpedia – Note 2935, Ijuhyaceae
Ijuhyaceae R.H. Perera, E.B.G. Jones, Maharachch., & K.D. Hyde, fam. nov.
Citation when using this data: Perera RH et al. 2023 – Fungalpedia.
Index Fungorum, Facesoffungi, MycoBank, GenBank.
Classification Hypocreales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Dikarya, Fungi.
Saprobic on wood and herbaceous debris, occurring on fresh plant material, sometimes fungicolous or parasitic on nematodes. Sexual morph: Ascomata perithecial, solitary or in groups, astromatic, sometimes with a thin basal subiculum, superficial, globose to subglobose, not collapsing or laterally pinched to slightly cupulate upon drying, white to pale yellow, sienna, dull orange, orange-yellow or brownish-orange, KOH-, LA-. Ascomatal apex faintly or acutely papillate, flat, usually discoid; disk formed of intertwined hyphae that often develop into triangular fasciculate hairs forming an apical crown, rarely apex discoidal without or with short, sinuous hairs. Peridium of single stratum or sometimes three strata. Hamathecium composed of septate, branched, filamented apical paraphyses, merging with periphyses, evanescent. Asci 6–8-spored, unitunicate, clavate to widely fusiform, evanescent, apex rounded, without an apical ring. Ascospores irregularly biseriate or multiseriate to fasciculate, clavate to fusiform to long fusiform, 1- to multi-septate or muriform, straight to slightly curved, guttulate, hyaline, smooth-walled to striate or spinulose, sometimes strongly cyanophilous. Asexual morph: Hyphomycetous, acremonium-like. Conidiophores originate from somatic hyphae, monophialidic, mononematous, straight, with one basal septum, hyaline, smooth-walled. Conidia solitary or aggregated at the tip of phialide, ellipsoidal to cylindrical, aseptate, with or without a visible abscission scar, guttulate, hyaline, smooth-walled. Microsclerotia rarely formed, often ellipsoidal to cylindrical oblong or occasionally globose, orange to brownish orange or brick red, KOH-.
Notes: The taxonomic placement of ljuhya has been debated for decades. ljuhya was initially accepted in Gymnoascaceae and was reassigned to Sphaeriaceae by Müller and von Arx (1973) and, later placed in Hypocreaceae (Rogerson 1970). Rossman et al. (1999) accepted Ijuhya in Bionectriaceae. In the analysis undertaken by Voglmayr and Jaklitsch (2019) Ijuhya and Kallichroma clustered together and formed a basal clade in Bionectriaceae, which indicates the weak relationship of these two genera to Bionectriaceae. In our phylogenetic analysis ljuhya and Kallichroma formed a clade distinct from Bionectriaceae and sister to the Flammocladiellaceae (Perera RH et al. 2023). The phylogenetic relationship between Ijuhya and Kallichroma was strongly supported in our analysis (93% MLBT; Perera RH et al. 2023). Therefore, we introduce new family Ijuhyaceae to accommodate Ijuhya and Kallichroma. Species of Ijuhya occur in both terrestrial or marine habitats while Kallichroma occurs in marine habitats (Kohlmeyer and Kohlmeyer 1993; Rossman et al. 1999; Abdel-Wahab et al. 2016).
Type genus: Ijuhya Starbäck.
Other accepted species: Species Fungorum – search Ijuhyaceae.
References
Müller E, von Arx JA 1973 – Pyrenomycetes: Meliolales, Coronophorales, Sphaeriales. In: The Fungi: An Advanced Treatise, Vol IVA. A Taxonomic Review with Keys: Ascomycetes and Fungi Imperfecti (Ainsworth, G. C., Sparrow, F. K. and Sussman, A. S., eds.), Academic Press, New York and London pp. 87−132.
Rogerson CT 1970 – The hypocrealean fungi (Ascomycetes, Hypocreales). Mycologia, 42:865–910.
Rossman AY, Samuels GJ, Rogerson CT et al. 1999 — Genera of Bionectriaceae, Hypocreaceae and Nectriaceae (Hypocreales, Ascomycetes). Stud Mycol 42:1–248.
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 14 August 2026.