Macalpinomyces tubiformis R.G. Shivas & Vánky

Description

Sori in some sessile and pedicellate spikelets of an inflorescence, greatly hypertrophied, destroying the innermost floral organs, long-tubiform, often bent or twisted, 25–50 mm long, 2–3 mm wide, covered by a grey peridium of host and fungal origin which ruptures longitudinally exposing the dark brown powdery mass of spores mixed with groups of sterile cells.

Spores globose, subglobose, usually ellipsoidal, 9.0–13.5 × 8–11 µm, olivaceous brown; wall uniformly 1.5–2.5 µm thick, including the dense acute pyramidal warts.

Sterile cells in irregular groups; individual cells globose, subglobose, ellipsoidal, 5.0–9.5 (–12) × 5–8 (–10) µm, hyaline; wall c. 0.5 µm, smooth.

Hosts
   
Host family: Poaceae
   
Host species: Chrysopogon fallax S.T.Blake

Distribution

States & Territories: NT, QLD

Comments

Macalpinomyces tubiformis has tubiform sori and spores covered in dense warts that are unlike those of other species of smut fungi infecting Chrysopogon.