Aerial hyphae scant, short, erect, loosely disposed, simple, becoming fertile. Autolytic activity absent or inconspicuous. No coilings noted. No diffusing pigment seen; odour indistinct or slightly mushroomy.
Chlamydospores rare. Conidiation noted after 4–6 days on scant short solitary conidiophores with minute wet conidial heads 10–40(–50) μm diam, and mostly dry in shrubs LY2109761 chemical structure becoming visible as white floccules, growing to circular or oblong pustules 1–2.5 mm diam, confluent to 5–7 mm length, spreading across the plate; after 6–11 days turning light green, 27DE4–6, 28CE5–7(–8), often with white margin; pustule surface appearing granular due to condensed whorls of phialides. Conidiation sometimes also within the agar in aged cultures. selleck screening library Conidiophores (after 10–12 days) usually on short stipes with mostly asymmetrical branching,
with two to several primary branches often dichotomously branched at several levels. Stipe and primary branches 6–10 μm wide, thick-walled (to 1.5 μm), with coarsely wavy outer wall; further branches thin-walled and 2.5–5 μm wide; origin of phialides often thickened, sometimes globose, to 7 μm wide. Branches often curved or sinuous. Peripheral conidiophores short (30–100 μm), variable, either with long sterile stretches and short irregular terminal heads, or regularly symmetrical with densely arranged, paired, 1–2 celled branches at right angles or slightly inclined upwards; often branches of similar length on all levels. Production of conidia starting within the pustule. Phialides solitary along terminal branches in short intervals and in whorls of 3–5(–6). Phialides (4–)5–10(–20) × (2.8–)3.0–4.0(–4.8)
μm, l/w 1.3–3.0(–6.3), (1.5–)2.3–3.2(–4.0) μm wide at the base (n = 70), variable, ampulliform or lageniform, with short necks, widest mostly below the middle; straight or curved upwards and inequilateral, sometimes sigmoid, typically narrowly lageniform on younger Gefitinib supplier and more simple conidiophores; terminal phialides in extension of main axes often appearing longer, but separated from the origin of the whorl by an additional cell. Conidia (2.5–)3.0–5.0(–6.8) × (2.0–)2.5–3.0(–3.7) μm, l/w (1.1–)1.2–1.6(–2.0) (n = 80), pale greenish, variable, ellipsoidal or subglobose, sometimes oblong, smooth, with 1–2 guttules; scar indistinct or narrowly projecting; aggregating in chains in age. At 15°C conidiation abundant in large green, 27–28CD4–7 to 27E4–8, pustules aggregating to 10 mm length. At 30°C either hyphae dying after a few days or colony dense, downy, with growth slowing down after 1 weeks; autolytic activity conspicuous, excretions yellow; conidiation effuse, colourless. On PDA after 72 h 5–8 mm at 15°C, 8–9 mm at 25°C, 1–3 mm at 30°C. Growth limited, typically stopping before covering the plate.