Hysteriales » Roussoellaceae » Neoroussoella

Neoroussoella heveae

Neoroussoella heveae Senwanna, Phookamsak & K.D. Hyde, in Phookamsak et al., Fungal Diversity Notes: 10.1007/s13225-019-00421-w, [66] (2019)

Index Fungorum number: IF55287           Facesoffungi number: FoF04825


Sexual morph: Undetermined. Asexual morph: Coelomycetous. Conidiomata 90–130 μm high, 115–180 μm diam., pycnidial, immersed, visible as small, brown to black dots on the host surface, solitary, scattered, globose, uni-loculate, glabrous, ostiole not observed. Conidiomata walls 7–15 μm wide, thick-walled, composed of several cell layers of dark brown to black, pseudoparenchymatous cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 3–7 × 2–5 μm (x̅ = 5.2 × 3.4 μm, n = 15), lining the inner cavity, difficult to distinguish from pycnidial wall, enteroblastic, phialidic, integrated, simple, short, hyaline, ampulliform to doliiform, thin-walled, smooth. Conidia 2.5–5 × 2–4 lm (x̅ = 4 × 3, n = 50), globose or subglobose to ellipsoidal, initially hyaline, becoming brown to dark brown, aseptate, with one or two guttules, rough-walled, verruculose.


Culture characteristics: Colonies on MEA reaching 20–25 mm diam. after 2 weeks at 25–30 ºC, colony from above, circular, medium dense, edge entire, velvety to woolly, white at the margin, white to yellowish in the middle, geenish grey to grey at the centre; from below, white at the margin, greenish grey at the centre, with concentric rings radiate.


Material examined: THAILAND, Phayao Province, Muang District, Mae Ka, on twig of Hevea brasiliensis (Euphorbiaceae), 5 December 2016, C. Senwanna, RBPY018 (MFLU 17-1983, holotype), ex-type living culture, MFLUCC 17-0338.


GenBank Accession No: ITS: MH590693, LSU: MH590689, SSU: MH590691.

Notes: Neoroussoella heveae is introduced based on morphological and phylogenetic evidence. Our strain forms a separate lineage, clusters with Neoroussoella species (78% ML). Neoroussoella heveae differs from the asexual morph of Neoroussoella species in having verruculose conidia, whereas, other Neoroussoella species have smooth-walled conidia.

Figure X. Neoroussoella heveae (MFLU 17-1983, holotype). a Conidiomata immersed in host substrate. b Section through the conidioma. c Conidioma wall. d–f Conidiogenous cells. g, h Colony on MEA (g = from above, h = from below). i Conidia. j Germinated conidium. Scale bars a = 200 µm, b = 100 µm, c = 20 µm, d–j = 5 µm.



Phookamsak R, Hyde KD, Jeewon R, Bhat DJ, et al. (2019) Fungal diversity notes 929–1035: taxonomic and phylogenetic contributions on genera and species of fungi. Fungal Diversity (2019) 95:1–273


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