Yelsemia lowrieana R.G. Shivas & Vánky

Description

Sori as blister-like swellings on the stems, floral pedicels, sepals, flowers or in the glands, globose, ellipsoidal or irregular by mutual pressure, 0.3 mm wide in the glands, 3 mm wide on the stalks, or larger by confluence, often polycystic, pustular, with a short narrow or broad stalk, at first covered by a thin green yellow or brown membrane of host origin which ruptures irregularly exposing the black granular-powdery mass of spores.

Spores subglobose, ellipsoidal or slightly irregular, 28–38 × 26–32 µm, with a dark reddish brown 14–21 µm wide equatorial band and 2 pale yellowish brown 4–7 µm high and 20–25 µm wide polar caps; wall uneven, 2.5–4.0 µm thick at the equatorial band, thinner beneath the polar caps (1.0–1.5 µm); wall of the polar caps c. 0.5 µm thick; spore surface finely and densely verruculose (including the polar caps); spore profile uneven.

Hosts
   
Host family: Byblidaceae
   
Host species: Byblis filifolia Planch.
Byblis rorida Lowrie & Conran

Distribution

States & Territories: WA

Comments

Yelsemia lowrieana is only the second smut fungus known to produce spores that separate from the outer spore wall. The other species, Kuntzeomyces ustilaginoideus (Henn.) Henn., was illustrated by Vánky (2002c).