Fungalpedia – Note 734, Amazonia
Amazonia. Theiss.
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
Epiphytic on leaves appearing as web-like colonies. Superficial hyphae branched, brown, septate, darker at the septa, with hyphopodia, hyphal setae absent. Hyphopodia brown to dark brown, alternate, 2-celled, capitate, on hyphae. Sexual morph: Ascomata superficial, gregarious to solitary, orbicular, flattened, with underlining radiating hyphae, branching at the rim, developing lateral hyphopodia, ascomatal setae and appendages lacking. Peridium comprising of radially arranged cells, poorly developed basal layer, with three strata comprising dark brown to black amorphous outer layer, central stratum comprising flattened, thick-walled, brown cells of textura angularis and hyaline to red- dish brown, flattened cells of inner stratum. Hamathecium comprising evanescent paraphyses. Asci 2-spored, hyaline, unitunicate, ellipsoid to obovoid, short pedicellate or apedicellate. Ascospores 2-seriate, 4-septate, initially hyaline becoming brown at the maturity, ellipsoid to subcylindrical, constricted and darker at the septa, smooth-walled. Asexual morph: Phialides ampulliform, sometimes curved, alternate or opposite on hyphae, mixed with capitate hyphopodia, pale brown to brown. Phialoconidia hyaline but rarely observed (Hongsanan et al. 2015a).
Notes: Theissen (1913c) introduced Amazonia with the type species Amazonia psychotriae (Henn.) Theiss. Amazonia resembles members of Meliolaceae in having unitunicate asci, and brown to dark brown, 4-septate ascospores and superficial hyphae with hyphopodia. Höhnel (1918a, b, c) mentioned that Amazonia resembles a combination of Meliola and Microthyrium based on its flattened ascomata with radial cells typical to Microthyriaceae (Wu et al. 2011a), while asci and ascospores are typical of Meliolaceae (Hongsanan et al. 2015a).
Type species: Amazonia psychotriae (Henn.) Theiss., Annlsmycol. 11(6): 499 (1913)
Other accepted species: Species Fungorum – search Amazonia.
Figure 1 – Amazonia leguminosarum. a Hypophodiate mycelium. b Ascomata. c Ascospores. Scale bars: a–c = 40 μm. Redrawn from Batista et al. (1965)
References
Hongsanan S, Tian Q, Peršoh D, Zeng XY et al 2015a – Meliolales. Fungal Divers 74(1):91–141.
Theissen F 1913c – Uber einige Microthyriaceen. Ann Mycologici 11:499.
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