Entylomaster typhonii Vánky & R.G. Shivas

Description

Sori as rounded or ellipsoidal leaf spots, c. 5–10 mm diam. or larger by confluence, sometimes covering almost the whole lamina, yellowish brown, with numerous minute scattered dark brown spore balls (especially on the abaxial surface).

Spore balls embedded in the leaf tissues, liberated by the their disintegration, formed of several small groups of aggregated spores; groups globose or ellipsoidal, c. 30–60 µm diam., honey-yellow, composed of 10 to several tens of spores that are tightly cohering or separated by remnants of fungal hyphae. Small balls grouped into irregular balls 100–200 µm diam., or larger by further agglomeration, pale to dark orange-yellow to brick-red, composed of hundreds of spores that separate by pressure. Fungal cortex lacking around the balls, but the large spore balls sometimes surrounded by a thin layer of compressed host cells.

Spores globose, subglobose, ellipsoidal, rarely irregular, with 1 or 2 flattened sides, 11.0–15.0 (–17.5) × 11.0–14.5 (–16.0) µm, lemon-, honey- to orange-yellow; wall ±uniformly 1.0–1.5 µm thick, smooth; spore profile often slightly undulate due to the remnants of surrounding empty hyphae. Spores formed on the apices of intercellular sporogenous hyphae; germination not known.

Sterile cells between the spores or spore balls absent.

Hosts
   
Host family: Araceae
   
Host species: Typhonium brownii Schott

Distribution

States & Territories: QLD