Hyphae smooth or rarely with warts, hyaline to brown, brown hyphae often with verrucose walls, hyphae sometimes aggregated into strands up to about 10 hyphae wide. Conidiophores irregularly and often copiously branched, comprising cells 2–5 µm long. Conidiogenous cells (6.5–)8–12  2–3 µm, pale brown to hyaline, mostly Type II (sensu Mostert et al. 2006), variable in shape, some ampulliform to subulate, slightly constricted at base, others with swollen, almost globose base, and in this case the adjacent cells of the conidiophore similarly swollen and constricted at septa; conidiogenous locus with non-flaring collarette about 1–1.5 µm long and wide, often with lateral conidiogenous locus on a short, narrow branch below septa on conidiophore. Conidia 4.5–6.5  1.5–2 µm, oblong-elliptic, straight to slightly curved, ends rounded, 0–septate, hyaline. Conidia on agar surface 5–7.5  1.5–2.5 µm, often curved, allantoid, cells within conidiophores and conidiogenous cells longer than in aerial mycelium, 12–20 µm long, mixture of Type II and Type III phialides. Cultural characteristics: Colonies on MEA 28–34 mm diam. after 16 days, aerial mycelium almost lacking, colony surface flat, dark brown (9F7) in patches towards the centre, margin entire, yellow pigmentation diffusing from edge of colony across plate. PDA 20–25 mm diam. after 16 days, aerial mycelium sparse, arranged in small upright tufts, agar surface undulate with radiate ridges, in reverse greyish-yellow (4B5), darker and more orange towards margin (5C8), bright yellow pigment diffusing across plate, margin scalloped. OA 23–33 mm diam., aerial mycelium cottony, in ropey upright strands, grey with a hint of yellow (2C2), yellow in reverse, margin scalloped.

In mycelio aerio hyphae singulae vel ad 10 fasciculatae, brunneae vel hyalinae, laeves vel verrucosae. Conidiophora plerumque ramosa. Phialides (6.5–)8–12  2–3 µm, terminales vel laterales, praecipue typi II, ampulliformes vel subuliformes, interdum fundo tumido. Conidia 4.5–6.5  1.5–2 µm, oblongo-ellipsoidea, hyalinae, 0–septatae; in agaro 5–7.5  1.5–2.5 µm, plerumque allantoidea.

Holotypus: New Zealand, Auckland, Whenuapai, on Vitis berlandieri x V. riparia, vascular staining of living wood, B. Weir ES63, 16 Jan 2007, ICMP 16988 (dried culture from holotype, PDD 92917).