Junewangia aquatica, Song & Zhong & Liao & Wang & Hu & Huang, 2018

Song, Hai-Yan, Zhong, Ping-An, Liao, Jiang-Lin, Wang, Zhao-Hai, Hu, Dian-Ming & Huang, Ying- Jin, 2018, Junewangia aquatica (Junewangiaceae), a new species from freshwater habitats in China, Phytotaxa 336 (3), pp. 272-278 : 275

Junewangia aquatica H.-Y. Song & D.-M. Hu, sp. nov. ( Fig. 2 ) MycoBank MB 823168

Etymology:— aquatica , referring to the aquatic habitat of the fungus.

Colonies effuse, consisting of conidiophores scattered over the substrate surface, olivaceous brown. Mycelium mostly immersed or superficial, consisting of branched, septate, smooth, thin-walled, pale brown hyphae. Stromata none. Setae and hyphopodia absent. Conidiophores 280–335 × 5–6 μm, macronematous, mononematous, pale brown to brown, paler towards the apex, smooth, thick-walled, multi-septate, unbranched, long cylindrical, slightly flared at the top, slightly flexuous, erect, with percurrent proliferations. Conidiogenous cells monoblastic, integrated, terminal or intercalary, pale brown to blackish brown, cylindrical, smooth, cicatrized. Conidia 17–20 × 14–18 μm (x = 18.8 × 15.8 μm, n = 30), holoblastic, acropleurogenous, solitary, dry, subglobose to broadly ellipsoidal, muriform, with longitudinal, transverse and oblique septa, pale brown to black-brown, evenly pigmented, thick-walled, with a distinctly protuberant basal cell; basal cells 5 μm wide, 2–5 μm long, cylindrical, truncate, subhyaline, pale brown to medium brown. Conidial secession schizolytic.

Specimens examined:— CHINA. Yunnan Province: Mengla , stream in rubber trees field (E101º 37´, N21º 24´, altitude 646 m), on submerged wood, 3 Apr 2016, D.M. Hu ( HFJAU 0700 , holotype) ; ibid. ( HFJAU 0701 ) .

Notes:— Junewangia aquatica is characterized by its flared conidiophores with percurrent proliferations, monoblastic, cylindrical conidiogenous cells, subglobose to broadly ellipsoidal conidia with transverse and oblique septa, features that fit well with the generic concept of Junewangia ( Baker et al. 2002a) . In the phylogenetic tree ( Fig. 1 ) inferred from combined SSU-ITS-LSU data, the isolate of Junewangia aquatica nested in the well-supported clade of Junewangia (BPP = 0.97; MLBS = 97 %). Both morphological and molecular data supported that the fungus belongs within the genus Junewangia . J. aquatica is morphologically distinct from the other species in Junewangia by its intercalary conidiogenous cells.

Figures

FIGURE 1. Phylogenetic tree inferred from a maximum likelihood analysis based on a concatenated alignment of SSU, ITS and LSU sequences of 17 strains representing Junewangia species and other Acrodictys-like species.The RAxML bootstrap support values (MLBS) and Bayesian posterior probabilities (BPP) are given at the nodes (MLBS/BPP). The tree is rooted to Orbilia vinosa (CBS 917.72).

FIGURE 2. Junewangia aquatica (from holotype: HFJAU 0700). a–b. Colonies on submerged wood. c. Conidiophore with attached conidia. d. upper part of a conidiophore, showing proliferation (arrow). e. Young conidium attached to conidiophore. f. Middle part of a conidiophore with attached conidia. g–j. Conidia. Scale bars: a–b = 100 μm, c = 20 μm, d–j = 5 μm.