Fusiconidium aquaticum Z.L. Luo & K.D. Hyde, 2017

Li, Junfu, Jeewon, Rajesh, Luo, Zonglong, Phookamsak, Rungtiwa, Bhat, Darbhe J., Mapook, Ausana, Phukhamsakda, Chayanard, Camporesi, Erio, Lumyong, Saisamorn & Hyde, Kevin D., 2017, Morphological characterization and DNA based taxonomy of Fusiconidium gen. nov. with two novel taxa within Melanommataceae (Pleosporales), Phytotaxa 308 (2), pp. 206-218 : 211-214

Fusiconidium aquaticum Z.L. Luo & K.D. Hyde , sp. nov. Fig. 2

MycoBank number: MB 817938; Facesoffungi number: FoF 02216

Etymology:—With reference to the aquatic habitat.

Holotype: HKAS 92705

Saprobic on submerged decaying wood. Sexual morph: Undetermined. Asexual morph: Colonies on the substratum superficial, effuse, gregarious, dark brown to black. Mycelium immersed, composed of septate, branched, smooth, pale brown hyphae. Conidiophores 49–65 μm long × 5.5–7.5 μm wide (x = 57 μm × 6.5 μm, n = 10), mononematous, macronematous, pale brown to brown, paler towards the apex, unbranched, straight or flexuous, smooth, erect, cylindrical, 1–3-septate. Conidiogenous cells enteroblastic, percurrent, sub-cylindrical to geniculate, slightly recurved, subhyaline to pale brown, thin-walled, smooth. Conidia 59–66 μm long × 15–18 μm wide (x = 62.5 μm × 16.5 μm, n = 25), acrogenous, fusiform to ellipsoidal with round at the apex and truncate base, mostly straight, infrequently slightly curved, with 8–10 transverse eusepta, rarely longitudinal septa, sometimes with guttules, initially subhyaline to pale brown, brown at maturity, with central cells brown to dark brown and terminal cells light brown, slightly rounded at the apex and truncate base, distinctly verruculose. Conidial secession rhexolytic.

Culture characteristics:—Conidia germinating on PDA within 14 hours at 23 ºC, with germ tubes produced from the second cell of ends. Colonies reaching 90 mm diam. after 6 weeks at room temperature, medium dense with mycelium semi-immersed to superficial, regular, flat, slightly raised, with undulate edge, slightly rough on surface, cottony, golden yellow; reverse saffron yellow.

Material examined:— CHINA, Yunnan Province, saprobic on decaying wood submerged in Dulong River, 6 May 2015, Z.L. Luo, HD 3–3–4 ( HKAS 92705, holotype!), ex-type living culture, KUMCC 15–0300, MFLUCC 16- 0991. (isotype in MFLU, as MFLU 15-0300).

Notes: — Fusiconidium aquaticum is different from F. mackenziei in having paler, narrow, short conidiophores (49–65 μm × 5.5–7.5 μm vs. 91–114 μm × 8.5–11 μm), large conidia (59–66 μm × 15–18 μm vs. 38–40 μm× 12–15 μm), with rarely longitudinal septa, distinctly verruculose and guttulate conidia ( Fig. 2 ). Fusiconidium aquaticum clusters with F. mackenziei ( Fig. 3 ).

Figures

FIGURE 2 Fusiconidium aquaticum (HKAS 92705, holotype) a–b. Colonies on the substratum. c–i. Conidiophores with conidia. j–p. Conidia. q. Germinating conidium. r. Surface view of culture on PDA. s. Reverse view of culture on PDA. Scale bars: c–i = 30 μm, j–l, n–q = 25 μm, m = 20 μm.

FIGURE 3. Phylogenetic construction using RAxML based analysis of a combined LSU, SSU, TEF1-α and RPB2 dataset. Bootstrap support values for Maximum Likelihood (ML, black), equal or greater than 50% and Bayesian posterior probabilities (PP, red) equal to or greater than 0.90 are shown above the nodes. The tree is rooted to Roussoella nitidula (MFLUCC 11-0634, MFLUCC 11-0182). The type strains are in black bold and the newly generated sequences are indicated in red bold.