Urocystis ranunculi (Lib.) Moesz

Synonyms

Sporisorium ranunculi Lib.
Tuburcinia ranunculi (Lib.) Liro
Tuburcinia ranunculi-muricati Vienn.-Bourg.

Description

Sori in leaves, petioles and stems, as conspicuous pustules of various shapes and sizes, at first covered by the host epidermis which soon ruptures exposing the black powdery mass of spore balls; later the leaves often become perforated.

Spore balls globose to elongate or irregular, 14–36 (–44) × 12–28 µm diam., composed of (0–) 1–3 (–5) spores, with or without a few peripheral sterile cells.

Spores globose, ovoid, elongate or irregular, 12.0–22.5 × 10.5–15.0 µm diam., light to dark reddish brown, with finely granular contents and a smooth c. 1 µm thick wall.

Sterile cells globose, ovoid to irregular, 7.0–14.5 (–16.0) × 6.5–10.5 (–11.0) µm, light yellowish brown, with a smooth 1.0–1.5 µm thick wall.

Hosts
   
Host family: Ranunculaceae
   
Host species: Ranunculus inundatus R.Br. ex DC.

Distribution

States & Territories: VIC

Comments

Although U. ranunculi occurs on Ranunculus spp. throughout the world, this smut has only been collected once in Australia, more than 100 years ago. McAlpine (1910: 196) recorded it as U. anemones (Pers.) G.Winter, an almost cosmopolitan species that occurs on Anemone spp. but which has not yet been confirmed in Australia.