Yelsemia droserae R.G. Shivas, Vánky & Athipunyakom

Description

Sori in all capsules of an inflorescence, destroying the seeds, swollen, globose, c. 1.5–2.0 mm diam., dark blackish brown. Mature capsules split longitudinally in several places, exposing the black powdery mass of spores.

Spores globose, slightly flattened, in side view subcircular or broadly elliptic, 25–33 µm wide, with a dark brown equatorial band, 20–28 µm thick, and 2 opposite swollen convex to semiglobose pale yellow polar caps on the flattened sides, 3–7 µm high, 12–20 µm wide; spores in surface view circular, elliptic, ovoid to slightly irregularly subpolygonal, 28–38 × 25.0–33.5 µm, dark brown to subopaque, with a circular paler central area corresponding to the polar caps; spore wall of the equatorial band 1.5–3.0 µm thick, slightly thinner (1.0–1.5 µm) beneath the polar areas, finely and densely verruculose; spore profile minutely uneven.

Hosts
   
Host family: Droseraceae
   
Host species: Drosera indica L.

Distribution

States & Territories: NT

Comments

The spores of Y. droserae are very similar in size to those of Y. lowrieana. However, the two species differ in sorus morphology, in the thickness of the spore wall at the equatorial band and in host family. In Y. lowrieana, the sori occur in the stems, flowers and glands, and they usually have a polycystic structure, the spore wall is 2.5–4.0 µm thick, and the host plant belongs to the family Byblidaceae.