Leucocintractia scleriae (DC.) M. Piepenbr., Begerow & Oberw.

Synonyms

Cintractia albida S. Ito
Cintractia javanica Racib.
Cintractia krugiana Magnus
Cintractia krugiana var. usambarensis Henn.
Cintractia scleriae (DC.) L. Ling
Cintractia usambarensis (Henn.) Cif.
Uredo scleriae DC.
Ustilago scleriae (DC.) Tul. & C. Tul.

Description

Sori surrounding all peduncles of inflorescences with rudimentary spikelets, cylindrical, often curved, 5–20 mm long, 2–3 mm wide, at first covered by a thick white peridium that later ruptures irregularly exposing a black agglutinated spore mass with a powdery surface.

Spores solitary, globose, subglobose or broadly ellipsoidal, (11–) 12–16 (–17) × (9–) 10–15 µm, laterally slightly flattened, 8–12 µm wide, light reddish brown, without appendages; wall 0.5–1.0 µm thick, covered by irregular coarse warts and ridges that are often connected by small transverse ridges or warts.

Spore germination resulting in phragmobasidia; cells separating readily, producing ellipsoidal basidiospores.

Hosts
   
Host family: Cyperaceae
   
Host species: Rhynchospora corymbosa (L.) Britton

Distribution

States & Territories: QLD

Comments

This species was reported under the name Cintractia leucoderma (Berk.) Henn. [= Leucocintractia leucoderma (Berk.) M.Piepenbr.] by McAlpine (1910: 172) who examined a specimen on Rhynchospora aurea from Bundaberg, Queensland. However, L. leucoderma has not been reliably recorded from Australia, and it differs from L. scleriae by having larger spores (17–19 µm long) and sori that surround the upper internodes of the culms. Re-examination of the Bundaberg specimen confirmed it to be L. scleriae.