Sporisorium vanderystii (Henn.) Langdon & Full.

Synonyms

Cintractia vanderystii (Henn.) Zundel
Sphacelotheca evansii Zundel
Sphacelotheca hyparrheniae (Beeli) Zambett.
Sphacelotheca kenyae Zundel
Sphacelotheca ritchiei Zundel
Sphacelotheca ruprechtii Syd.
Sphacelotheca vanderystii (Henn.) L. Ling
Sporisorium puellare (Syd.) G. Deml
Ustilago hyparrheniae Beeli
Ustilago hyparrheniae Hopkins
Ustilago puellaris Syd.
Ustilago vanderystii Henn. (as "vanderysti")

Description

Sori occupying all racemes or raceme-pairs of an inflorescence, cylindrical, usually forked, Y- or V-shaped, 4–8 mm long, 1–2 (–2.5) mm wide, partly concealed by the spathae, at first covered by a thick brown peridium that ruptures irregularly exposing the semi-agglutinated to powdery mass of spores and sterile cells surrounding a stout simple or bifurcate columella c. the length of the sorus, often with short branches; rarely, the sori restricted to the spikelet-pairs.

Spores when mature solitary, globose, ovoid, ellipsoidal to rarely elongate or slightly irregular, (7.5–) 8–11 (–12) × 7–10 µm, yellowish brown; wall uniformly 0.5–0.8 µm thick, finely and densely punctate-verruculose; spore profile smooth; in SEM spore surface finely and densely echinulate, between the spines finely and densely verruculose.

Sterile cells in small irregular groups; individual cells globose, ellipsoidal or irregularly polyangular with flattened side(s), 9–24 (–30) µm long, hyaline or subhyaline; wall 0.5–1.5 µm thick, smooth.

Spore germination resulting in a branched multicellular mononucleate mycelium.

Hosts
   
Host family: Poaceae
   
Host species: Hyparrhenia filipendula (Hochst.) Stapf

Distribution

States & Territories: QLD

Comments

Occurs on Hyparrhenia filipendula in Qld and NSW; also on Exotheca, Hyparrhenia and Hyperthelia spp. in Papua New Guinea, Africa, Europe and South America.

The possible conspecificity of S. vanderystii with S. andropogonis (Opiz) Vánky [type on Dichanthium ischaemum (L.) Roberty] was discussed by Vánky (1994a: 198–199).