Rhamphospora nymphaeae D.D.Cunn.

Synonyms

Entyloma castaliae Holway
Entyloma dubium Cif.
Entyloma nymphaeae (D.D.Cunn.) Setchell

Description

Sori scattered or gregarious initially light yellow, later brown spots, round or by confluence irregular, often perforated with age.

Spores embedded in the host tissue, subglobose to ovoid, usually lemon-shaped, papillate at one end (1–2 µm high) and appendiculate at the other end from remnants of the sporogenous hypha, 8–14 × 7–11 µm, hyaline or light yellow; wall c. 1.5 µm thick, smooth or finely and densely verruculose. Spores formed subterminally on the branches of ramified sporogenous hyphae, especially in the large air-canals but also in any free space between cells of the leaf.

Spore germination: Mature spores germinating without a resting period, often while the leaf is still alive. An aseptate basidium produces 4–6 apical fusiform often slightly bent basidiospores on short sterigmata. Basidiospores with 2–3 retraction(?) septa, to 21 µm long c. 0.9 µm wide, fusiform; secondary sporidia produced on short pedicels, perpendicular to the long axis of the basidiospores. Secondary sporidia sometimes producing tertiary sporidia in the same way, or secondary sporidia conjugating in pairs by a short or long conjugation bridge. Hyphae intercellular, septate, with clamp connections, binucleate, branching, with well-developed intracellular ramified binucleate haustoria.

Anamorph not seen.

Hosts
   
Host family: Nymphaeaceae
   
Host species: Nymphaea alba L.
Nymphaea capensis Thunb.

Distribution

States & Territories: NSW