Microbotryum nivale (Liro) Vánky

Synonyms

Ustilago nivalis Liro

Description

Sori in ovules, filling the swollen capsules with an initially agglutinated, later powdery purplish brown spore mass. Infection systemic.

Spores globose, subglobose, broadly ellipsoidal or ovoid, 10.5–13.0 (–14) × 10.5–12.5 µm, pale yellowish brown with a violet tint; wall 1.5–2.5 µm thick, finely reticulate, 5–8 meshes per spore diameter; muri 0.7–1.0 (–1.5) µm high, in median view appearing as acute projections, in SEM the interspaces are verruculose or occasionally with 1 or 2 protuberances.

Hosts
   
Host family: Caryophyllaceae
   
Host species: Sagina apetala Ard.

Distribution

States & Territories: SA

Comments

Australian and New Zealand specimens have taller muri (more than 1.0 µm high) than the type specimen from Norway, which has muri 0.7–1.0 µm.