Codinaea terminalis (C.G. Lin and K.D. Hyde) Réblová and Hern.-Restr., Journal of Fungi 7(12, no. 1097): 44 (2021).

Index Fungorum number: IF842200; Facesoffungi number: FoF 06287.

Holotype – MFLU 19-0214.

Saprobic on dead bamboo culms in freshwater habitats. Sexual morph: undetermined. Asexual morph: hyphomycetous. Colonies on natural substrate superficial, effuse, gregarious, white, shining, globose aggregated in a large mass. Mycelium mostly immersed, composed of septate, smooth, branched and pale brown hyphae. Setae 99–277 µm long, 3.1–4.7 µm wide at the base (x¯ = 153 × 3.8 µm, n = 25), fertile, straight or slightly flexuous, dark brown at the base, paler towards the apex, septate, smooth-walled, unbranched, cylindrical. Conidiophores 34–62 × 3–4 µm (x¯ = 48.3 × 3.4 µm, n = 20), macronematous, mononematous, erect, in groups from the mycelial knots from the bases of setae, cylindrical, slightly swollen at the base, straight or slightly flexuous, brown at the base becoming pale brown or subhyaline towards the apex, 2–4-septate, unbranched, smooth, guttules. Conidiogenous cells 14.5–36 µm long (x¯ = 24 µm, n = 20), monophialidic, terminal, integrated, cylindrical, brown at the base, pale brown to subhyaline towards the apex, narrowing below the flared and conspicuous collarette. Conidia 13.5–16 × 2.5–3.3 µm (x¯ = 14.5 × 2.9 µm, n = 35), aggregated in a glistening mass of conidia at the tip of conidiophores, amerospores, acrogenous, fusiform, mostly curved, guttules, rough-walled, hyaline, with hair-like and 9.6–11.5 µm-long appendages at both ends.

Culture characteristics – Conidia germinating on PDA within 15 h and germ tubes produced from conidia. Colonies growing on PDA, reaching 19 mm in diam. in 10 days at 25 °C, circular, flat with a protuberance in the center, white, entire margin with thin mycelia; pale yellow to white from center to edge in reverse and not producing pigmentation in culture.

Material examined – CHINA, Guizhou province, Zunyi city, Chishui county, Hushi town, Chishui Alsophila Natural Reserve (28°29′43″ N, 106°0′24″ E), on dead bamboo culms from a stream, 22 September 2019, Jing-Yi Zhang, Y124 (HKAS 123756 = GZAAS 22-0070); living culture, GZCC 22-0086.

GenBank accession numbers – LSU: ON502895, ITS: ON502902.

NotesCodinaea terminalis was introduced by Lin et al. [], isolated from decaying leaves in China. The morphology of our isolate shares similar characters with the ex-type strain Codinaea terminalis (GZCC 18–0085). However, there are some differences in the size of the microstructure, such as obviously longer setulae (9.6–11.5 µm vs. 4–9.5 μm). Our new isolate clustered among two Dictyochaeta terminalis strains (GZCC 18–0085 and GZCC19-0525) with strong statistical support (99% ML/1.00 PP, Figure 1). Thus, we identified this isolate as a new host record of Coterminalis on dead bamboo culms in China.

Figure 1. Codinaea terminalis (HKAS 123756). (a) Host material; (b,c) colonies on host surface; (d,e) conidiophores with conidiogenous cell; (fh) conidiogenous cells; (im) conidia; (n) germinating condium; (o,p) culture on PDA from above and below. Scale bars: (b) 200 μm; (c) 100 μm; (d,e) 20 μm; (fo) 10 μm.