Jamesdicksonia brunkii (Ellis & Galloway) J. Walker & R.G. Shivas

Synonyms

Tilletia brunkii (Ellis & Galloway) Durán
Tolyposporella brunkii (Ellis & Galloway) G.P. Clinton
Ustilago apiculata Ellis & Galloway
Ustilago brunkii Ellis & Galloway

Description

Sori on adaxial surface of leaf sheaths, forming striae fusing into a blackish brown agglutinated to granular-powdery coat of spore masses, showing through the outer surface of the leaf sheaths between the veins as pale lead-coloured striae of varying length.

Spores globose, subglobose to ovoid (subpolyhedrally irregular in some specimens), 10–20 (–24) × 10–18 µm, yellow to dark reddish brown; wall 3–8 µm thick, consisting of a homogenous endospore 1–2 µm thick and a smooth multilayered exospore, sometimes with a short hyaline papilla. [Spore measurements made in unheated lactophenol; in heated lactophenol or in water the spore wall and the spores swell considerably.]

Spore germination resulting in holobasidia producing 4–8 apical allantoid to fusiform symmetrical septate basidiospores that do not fuse but germinate apically to produce ballistoconidia. Asymmetrical ballisto-basidiospores also produced on basidial sterigmata.

Hosts
   
Host family: Poaceae
   
Host species: Dichanthium sericeum (R. Br.) A. Camus

Distribution

States & Territories: WA

Comments

Occurs on Dichanthium sericeum (Poaceae) in WA; also on Andropogon, Bothriochloa, Dichanthium and Schizachyrium spp. in North, Central and South America and the Caribbean.