Pilocintractia fimbristylidicola (Pavgi & Mundk.) Vánky

Synonyms

Cintractia fimbristylidicola Pavgi & Mundk. (as "fimbristylicola")

Description

Sori in some flowers of an inflorescence surrounding the ovaries, black, globose to ovoid, compact, hard, not powdery, 1–2 mm long, 0.5–1.5 mm wide, visible between the spreading glumes. Spore mass compact, blackish brown. Peridium absent; basal stroma present or absent; spores produced successively in cup-shaped pockets on the surface of the nuts, delimited by sterile yellowish brown fungal tissue composed of tightly packed elongate uniformly thin c. 1 µm wide cells; in longitudinal section c. 100–200 µm long and 15–40 µm wide compact fascicles, distally narrowing into a conical tip. Distally from the pockets there is a thick layer of mature spores permeated by hyaline sterile hyphae. Long loose radially arranged hyaline fascicles of elongate sterile filaments also present between the spore masses; usually the filaments solitary, interweaving the whole mass of mature spores. Filaments 1.5–5.0 µm wide, with thin elongate protoplasmic contents and a relatively thick but variable ±gelatinised wall.

Spores flattened, in side view elliptic, without hyaline appendages, 6–8 µm wide, in plane view elliptic, ovate or subpolygonally irregular, 9–12 (–13) × 8.5–10.5 µm, yellowish brown; wall uniformly 0.5–0.8 µm thick, in LM finely granular-verruculose, spore profile smooth to finely wavy, in SEM warts partly confluent forming a fine to rough irregular reticulum.

Hosts
   
Host family: Cyperaceae
   
Host species: Fimbristylis bisumbellata (Forssk.) Bubani

Distribution

States & Territories: NT

Comments

Occurs on Fimbristylis bisumbellata in the NT; also on F. complanata and F. spadicea in Asia and Central and South America.