Corynespora lignicola2020

Corynespora lignicola Z.L. Luo, H.Y. Su & K.D. Hyde, sp. nov.  2020

Index Fungorum number: IF557059; Facesoffungi number: FoF07073  

Holotype: China, Yunnan Province, saprobic on decaying wood submerged in Nujiang River, May 2015, S.M. Tang, S-334 (HKAS 92792, holotype), ex-type living culture MFLUCC 16–1301. 

Morphological description

Saprobic on decaying wood submerged in freshwater habitats. Sexual morph Undetermined. Asexual morph Colonies on natural substrate effuse, dark brown to black. Mycelium partly superficial, partly immersed in the substrate, composed of branched, septate, subhyaline to brown, smooth-walled hyphae. Conidiophores (350–)470–670(–700) μm (x̄ = 570 μm, SD = 100, n = 10) long, 9–13 μm (x̄ = 11 μm, SD = 2, n = 10) wide, macronematous, mononematous, erect or ascending, simple, straight or flexuous, septate, smooth. Conidiogenous cells monotretic, cylindrical, pale brown to brown, often with proliferation through the apical pore and formation of another conidium at the apex of the proliferation, branched. Conidia 110–156 μm (x̄ = 133 μm, SD = 23, n = 20) long, 7–9 μm (x̄ = 8 μm, SD = 1, n = 20) wide, formed singly or in a short chain through a wide pore at the apex of the conidiophore, cylindrical, straight or slightly curved, smooth, subhyaline to pale brown, distoseptate. Culture characteristics – Colonies on MEA attaining 15 mm diameter within 20 days at 25℃ under natural light, velvety, centrally raised, pale brown or greyish olivaceous, reverse grey olivaceous to dark brown. 

Habitat: decaying wood submerged in Nujiang River

Distribution: China

GenBank Accession: ITS MN860549 ;LSU MN860554 

Notes: Corynespora lignicola resembles C. encephalarti in having macronematous, erect, straight, smooth-walled conidiophores, monotretic, cylindrical conidiogenous cells and distoseptate conidia which are similar in size. However, Corynespora lignicola differs from C. encephalarti in having cylindrical, straight or slightly curved, subhyaline to pale brown conidia, while C. encephalarti has obclavate, medium olivaceous brown to dark brown conidia (Crous et al. 2019b), and Corynespora lignicola is phylogenetically distinct from all species that have DNA sequences. 

Reference: Hyde KD, de Silva NI, Jeewon R et al. 2020 – AJOM new records and collections of fungi: 1–100. Asian Journal of Mycology 3(1), 22–294, Doi 10.5943/ajom/3/1/3 

Corynespora lignicola (HKAS 92792, holotype). a Colony on natural substrate.  b Conidiophore with conidia. c–f Conidia. Scale bars: b = 150 μm, c–f = 30 μm.