| Characteristics |
Lesions commonly causing discoloration of the tissues, pale green or yellow, later becoming brown, diffused but rarely vein-limited, covering larger areas; infected tissues become necrotic. Down present on the under surface of host leaf, whitish, consisting of agglomerated to scattered conidiophores, felt-like, dense. Conidiophores emerging through stomata, up to 8 in a fascicle, colourless, straight, (220–)250–322–394(–450) µm; trunk straight, (84–)189–337–485(–656) µm long, (6.5–)7.2–8.4–9.6(–11.8) µm wide below the first branch, basal end not differentiated or slightly bulbous, (8.0–)9.8–11.6–13.4(–15.7) µm wide; callose plugs often present in trunk and branches; branches dichotomous, 4–6 orders. Ultimate branches in pairs in most cases, rarely single, slightly curved to substraight, 5–23 µm long; vesicles regular globose, 9–11 µm diam., bearing 5–6 ultimate branchlets with lengths of 5–8 µm. Conidia colourless, oblong to ovoid, almost symmetrical at the equatorial plane, (14.1–)15.2–16.0–16.9(–18.0) µm long, (13.9–)14.7–15.2–15.8(–16.4) µm wide, l/w ratio (0.98–)1.00–1.05–1.10(–1.19), greatest width median to submedian, tip round, base broadly round; pedicel present as a scar, having thin-walled papilla from which a germ tube is produced. Resting organs not seen. |
