Fungalpedia – Note 678, Cocconia
Cocconia Sacc.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank.
Classification: Parmulariaceae, Asterinales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Epiphytic and parasitic on leaves. Sexual morph: Ascos- tromata gregarious to solitary superficial, shield-like, dark brown to black, coriaceous, flattened, smooth ascomatal margins, connected to internal stroma by hyphal tubes or clusters. Internal stroma well-developed, with ridges radiating from the centre to the outer rim, ridges containing elongate locules, opening by a longitudinal slit, thick-walled, elongated and composed of black, amorphous tissues in the stromatic crust. Hamathecium comprising of hyaline, cellular, branched or unbranched, septate pseu- doparaphyses. Asci 8-spored, bitunicate, cylindrical to clavate, thick-walled, sessile or short-pedicellate, with a distinct ocular chamber, thickened at the apex. Ascospores 2–3-seriate, 1-septum, ellipsoidal or ovate-oblong, with rounded ends, hyaline to brown, constricted at the septum, obtuse on both sides, smooth-walled (Jayasiri et al. 2016). Asexual morph: Undetermined.
Notes: Saccardo (1889) established Cocconia with the type species of Cocconia placenta which was previously introduced as Rhytisma placenta. Cocconia is characterized by superficial, shield-like, dark brown to black, carbonaceous, flated ascomata producing thick-walled, cylindrical to cylindrical clavate asci and ellipsoidal, 1-septum, brown ascospores (Jayasiri et al. 2016). It morphologically resembles Parmulariaceae by the superficial, flattened, shield-like, carbonaceous ascomata with ridges radiating from the centre to the outer rim (Jayasiri et al. 2016; Hongsanan et al. 2020a).
Type species: Cocconia placenta (Berk. & Broome) Sacc., Syll. fung. (Abellini) 8: 738 (1889)
Other accepted species: species Fungorum – search Cocconia.
≡Rhytisma placenta Berk. & Broome, J. Linn. Soc., Bot. 14(no. 74): 131 (1873) [1875]
References
Saccardo (1889) Sylloge Fungorum (Abellini) 8:738.
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