Aquidictyomyces appendiculatus W. Dong, H. Zhang & K.D. Hyde, sp. nov. Fig. 30

MycoBank number: MB 558083;  Index Fungorum number: IF 558083; Facesoffungi number: FoF 09568;

Etymology – in reference to the long appendages of the fungus

Holotype – MFLU 18-1528

Saprobic on submerged wood in freshwater. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Colonies superficial, effuse, gregarious, hairy, pale brown. Mycelium mostly immersed, composed of septate, branched, pale brown, thin-walled hyphae. Conidiophores 35–140 × 3–4.5 μm ( x = 85 × 4 μm, n = 10), macronematous, mononematous, erect, cylindrical, straight or slightly flexuous, septate, robust at the base, unbranched, brown, paler at the apex, smooth. Conidiogenous cells 5–50 × 2.5–3.5 μm ( x = 22 × 3 μm, n = 10), holoblastic, monoblastic, integrated, determinate, terminal, subcylindrical, pale brown, smooth. Conidia 11–14.5 × 7–9.5 μm ( x = 13 × 8.5 μm, n = 20), acrogenous, solitary, dry, thin- walled, smooth-walled, ginger-shaped, hyaline to pale brown, dictyoseptate, with one primary central, longitudinal, straight or curved septum, mostly with two transverse or oblique septa, constricted at septa, with 4–8 protuberances at the apex, rounded or truncate at the base, with two tapering, persistent arms curving upwards at two sides of the body, attached fibroid, hyaline appendages, 4–9 μm long for arms and 17–45 μm long for appendages.

Culture characteristics – On PDA, colony circular, slow growing, reaching 7 mm in 30 days at 25°C, white and pale brown from above, black from below, surface rough, dry, with dense mycelium, raised, entire at edge.

Material examined – Thailand, Songkhla Province, on submerged wood in a stream, 10 May 2018, W. Dong, 20180517 (MFLU 18-1528, holotype), ex-type living culture KUMCC 19-0061; ibid., HKAS 105043, isotype.

Figure 30 – Aquidictyomyces appendiculatus (MFLU 18-1528, holotype). a Colonies on submerged wood. b–d Conidiophores with conidia. e–g Conidia. h Germinated conidium. i, j Colony on PDA (left-front, right-reverse). Scale bars: b, c = 10 μm, d–h = 15 μm.