Fungalpedia – Note 675, Aulacostroma
Aulacostroma Syd. & P. 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
Parasitic on leaves appearing as black dots. Superficial mycelium subcuticular, consisting of regular and minutely reticulate-branched hyphae. Sexual morph: Ascomata superficial, scattered to gregarious, usually densely aggregated, completely confluent, variable in shape and size, mostly elongated or irregular, flattened, carbonaceous, subhyaline, indistinctly fibrous, circular with radiating hyphae. Hyphae dark brown, branched, straight or irregularly curved, septate, bearing irregular or oblong bulbils in the axils. Hamathecium consists with hyaline-greenish pseudoparaphyses. Asci 8-spored or 4–6-spored, bitunicate, broadly clavate, broadly ovoid, ellipsoid or subglobose, sessile, rounded at the apex, thick-walled. Ascospores pale brown, 1-septum, ellipsoid or obovoid to oblongellipsoid, broadly rounded on both sides, constricted at the septum, smooth-walled. Asexual morph: Conodiomata morphologically identical to ascostroma. Conidia cylindrical, obtuse on both sides, sessile, pale brown, both sides broadly rounded, 1-septum, constricted, pale brown, smooth-walled (Sydow and Sydow 1914).
Notes: Sydow and Sydow (1914) established Aulacostroma to accommodate Aulacostroma palawanense which was reported as pathogenic on Pandanus merrillii in Philippines (Wijayawardene et al. 2018, 2020). Aulacostroma is charac- terized by stromatic, solitary to gregarious, superficial, black ascomata, broadly clavate, globose to subglobose, obovoid asci and pale brown ellipsoid, 1-septum ascospores (Inácio and Cannon 2008; Hongsanan et al. 2020a). Species of this genus have external hyphae with bulbil-like structures and extensive internal stroma which do not penetrate the mesophyll (Inacio et al. 2012).
Type species: Aulacostroma palawanense Syd. & P. Syd., Philipp. J. Sci., C, Bot. 9(2): 176 (1914).
Other accepted species: species Fungorum – search Aulacostroma\
Figure 1 – Aulacostroma palawanense. a Ascomata. b, c Section through ascoma. d Ascospore. e Branched hyphae with appressoria. Adapted from Sydow and Sydow (1914)
References
Sydow H, Sydow P 1914 – Fungi from northern Palawan. Philipp J Sci 9:157–189.
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