Pseudotracya otteliae Vánky

Description

Sori in the leaves, forming indistinct yellow to yellowish brown spots, 2–10 mm diam., with spore balls embedded in the host tissue appearing as minute brown slightly elevated dots; post-mature sori often perforated due to destroyed host tissues.

Spore balls persistent, globose, ovoid or elongate, 110–220 (–270) × 80–170 µm, light brown, composed of a cortical layer of firmly cohering spores and a central mass of parenchymatous fungal tissue.

Spores in surface view irregularly polyangular, (5–) 6–12 × (5–) 6.0–9.5 µm, verrucose; in side view subquadrangular or radially elongate, subtetrangular, rarely subtriangular, 10–13 × 4–9 µm, pale yellowish brown; outer free verrucose wall 1.5–2.5 µm thick; contact and inner walls thin, c. 0.5 µm, smooth. Central mass of parenchymatous tissue composed of empty cells 5–15 × 2.5–8.0 µm, pale yellowish brown; wall thin, c. 0.4 µm, smooth.

Spore germination not known.

Hosts
   
Host family: Hydrocharitaceae
   
Host species: Ottelia ovalifolia (R.Br.) Rich.

Distribution

States & Territories: QLD