Fungalpedia – Note 631, Inocyclus
Inocyclus Theiss. & Syd.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1
Classification: Parmulariaceae, Asterinales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Epiphytic on living leaves appearing as black dots. Sexual morph: Ascostromata superficial, solitary to clustered, dark brown to black, appearing as black circular domes, circular to irregular, loculate. Peridium 2-layered, comprising of of dark brown cells of textura oblita, outer layer composed of thick and pigmented, inner layer thin and hyaline. Hamathecium lacking pseudoparaphyses. Asci immersed in a gelatinous layer becoming slightly blue in Iodine, 8-spored, bitunicate, cylindrical to clavate, short pedicellate, ocular chamber present. Ascospores biseriate, 1-septum, ovoid to ellipsoidal, apiosporous, slightly constricted at the septum, initially hyaline becoming pale brown to brown at maturity, thin and smooth-walled. Asexual morph: Undetermined (Boonmee et al. 2017; Dai et al. 2018).
Notes: Theissen and Sydow (1915) introduced Inocyclus with the type species I. psychotriae. The genus was initially accepted in Parmulariaceae based on its blackened circular, loculate ascomta, subcylindrical asci and hyaline ellipsoidal to clavate ascospores (Guatimosim et al. 2014a). Boonmee et al. (2017) suggested that the type species I. psychotriae differs from I. angularis in having hypophyllous ascomata with verrucose apiospores, subcylindrical to clavate and short pedicellate asci, while I. angularis has amphigenous ascomata, locules arranged in one-two rings, with an undulated surface, uniseptate at the centre of the ascospores (Fig. 1). The morphology of Inocyclus more resembles Parmulariaceae by its blackish carbonaceous ascostromata, hyaline, septate, filamentous pseudoparaphyses and ellipsoidal, apiospores, 1-septum ascospores (Dai et al. 2018). Guatimosim et al. (2015) provided the first molecular data for I. angularis and our phylogenetic analysis confirms the placement of Inocyclus in Asterinales. Therefore, we accept this genus in Asterinales incertae sedis until further in-depth studies with molecular data.
Type species: Inocyclus psychotriae (Syd. & P. Syd.) Theiss. & Syd., Annls mycol. 13(3/4): 211 (1915).
Other accepted species: Species Fungorum – search Inocyclus.
Figure 1 – Inocyclus psychotriae (K 180637, lectotype). a Colonies on the leaf surface. b Ascus. d Ascospores. Scale bars: b = 10 μm, c = 5 μm. Redrawn from Dai et al. (2018)
References
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