Entyloma calendulae (Oudem.) de Bary

Synonyms

Protomyces calendulae Oudem.

Description

Sori in leaves, visible as round often slightly swollen spots, at first pale yellowish green to brownish green, becoming brown, 1–5 (–10) mm diam.

Spores globose, subglobose, ovoid to irregularly polyhedral, 9–16 (–18) × 8–13 µm, isolated or cohering in irregular groups, subhyaline to yellow; spore wall smooth, 2-layered, unequal, thickest at the angles, 1–4 µm thick, sometimes with remnants of hyphal filaments.

Spore germination resulting in aseptate basidia with 4–8 terminal cylindrical basidiospores that give rise to hyphae after conjugation.

Hosts
   
Host family: Asteraceae
   
Host species: Calendula officinalis L.

Distribution

States & Territories: NSW, SA, VIC

Comments

Entyloma calendulae causes an important disease of cultivated Calendula (marigold). Its anamorphic stage produces conidia that are spread locally by wind and rain. This smut is soil-borne as the teliospores can survive successive seasons in plant residues in the soil.