Fungalpedia – Note 637, Irenopsis
Irenopsis. F. Stevens.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1
Classification: Meliolaceae, Meliolales, Meliolomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Colonies epiphytic on leaves and stems. Superficial hyphae branched, brown, septate, darker at the septa, with hypho- podia, hyphal setae absent. Hyphopodia capitate, 2-celled, brown, alternate or opposite, angular or lobate, near to hyphal septa. Sexual morph: Ascomata superficial, globose to subglobose, with thick-walled, ascomatal setae curved or hooked at the apex. Peridium comprises two strata, thouter stratum thick-walled, dark brown cells of irregular textura angularis, inner stratum of flattened hyaline cells and dark brown cells of textura angularis when viewed in squash mounts. Hamathecium with evanescent paraphyses. Asci 2–4-spored, unitunicate, obovoid to ovoid, evanescent. Ascospores 2-seriate, oblong to ovoid, initially hyaline becoming brown at maturity, 4-septate, constricted and darker at the septa, rounded ends, smooth-walled. Asexual morph: Phialides ampuliform, opposite or alternate, pale brown to brown. Conidia hyaline, rarely observed (Hongsanan et al. 2015a).
Notes: Irenopsis was established by Stevens (1927) with the type I. tortuosa. This genus is distinguished in having true setae on the ascomata and lacking hyphal setae (Hyde et al. 2020b). According to the recent phylogenetic analyses, species of Irenopsis form a distinct clade from other genera in Meliolaceae (Hyde et al. 2020b; Zeng et al. 2020).
Type species: Irenopsis tortuosa (G. Winter) F. Stevens,Annls mycol. 25(5/6): 439 (1927)
Other accepted species: Species Fungorum – search Irenopsis.
Figure 1 – Irenopsis triumfettae var. indica. a Hypophodiate mycelium. b Phialides. c Ascospores. d Perithecial setae. Scale bars: a– d = 7 μm. Redrawn from Hosagoudar and Riju (2013)
References
Stevens FL 1927 – The Meliolineae I. Annal Mycol 25:405–477.
Hosagoudar VB 2013 – Meliolales of India. J Threatened Taxa 5:3701–3788 3:3993–4068.
Hongsanan S, Tian Q, Peršoh D, Zeng XY et al 2015a – Meliolales. Fungal Divers 74(1):91–141.
Entry by
Diana Sandamali Marasinghe, 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 29 August 2023