Aquasubmersa mircensis H. Zhang & K.D. Hyde
Etymology: mir = from, MRC (Mushroom Research Centre) “ensis”, the location of the fungus.
Saprobic on submerged wood in a freshwater stream. Sexual morph: Undetermined. Asexual morph: Pycnidia 130–170 μm high, 150–250 μm diam., subglobose to ellipsoidal, dark brown to black, semi-immersed to superficial, solitary, unilocular, ostiolate, with wall up to 20 μm thick, with outer layer of the wall brown and cells occluded, the inner layers of the wall hyaline and elongated cells; ostiole dark-brown, circular, centric, short papillate. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 10–14 μm long, 4–7 μm wide, determinate, discrete, lageniform, hyaline, smooth, formed from the inner layer of cells of the pycnidial wall. Conidia 16–21 × 8–11 μm (x̄ = 18.3 × 9.4 μm, n = 10), holoblastic, initially unicellular, ellipsoidal, some with papillate bases, hyaline, thin-walled with guttulate content.
Culture characteristics: In on PDA, colony circular, slow growing, 20 mm in 20 days, at 25°C, grey from above, black from reverse, raised, felty-woolly, fairly dense, aerial with a sinuate edge, slightly staining agar to brown around the culture.
Material examined: THAILAND, Chiang Mai, Mushroom Research Centre, on submerged wood, 21 April 2011, Huang Zhang m3 (MFLU 11–1001, holotype), ex-holotype living culture MFLUCC11–0401 = IFRDCC 2572.
Freshwater distribution: Thailand (Zhang et al. 2012)
Dong W, Wang B, Hyde KD, McKenzie EHC, Raja HA, Tanaka K, Abdel-Wahab MA, Abdel-Aziz FA, Doilom M, Phookamsak R, Hongsanan S, Wanasinghe DN, Yu X-D, Wang G-N, Yang H, Yang J, Thambugala KM, Tian Q, Luo Z-L, Yang J-B, Miller AN, Fournier J, Boonmee S, Hu D-M, Nalumpang S, Zhang H (2020) Freshwater Dothideomycetes. Fungal Divers 105:319–575
Zhang H, Hyde KD, Mckenzie EHC, Bahkali AH, Zhou D (2012) Sequence data reveals phylogenetic affinities of Acrocalymma aquatica sp. nov., Aquasubmersa mircensis gen. et sp. nov. and Clohesyomyces aquaticus (freshwater coelomycetes). Cryptogam Mycol 33:333–346. https://doi.org/10.7872/crym.v33.iss3.2012.333
Figure 1. Aquasubmersa mircensis (Material examined: THAILAND, Chiang Mai Province, Mushroom Research Centre, on submerged wood, 21 April 2011, H. Zhang, m3, MFLU 11-1001, holotype). a. Pycnidium on wood surface, b. Section of pycnidium, c. Peridium with conidiogenous cells, d. Conidiogenous cells with conidia, e, f. Conidia. Scale bars: b = 100 µm, c = 20 µm, d = 15 µm, e, f = 10 µm. (Images from Dong et al. 2020)