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Puccinia tricholaenae (Syd. & P. Syd.) T.S. Ramakr. & K. Ramakr

Description
Uredinia on leaves, amphigenous, erumpent, linear, up to 1 mm long, reddish brown.

Urediniospores globose, subglobose or broadly ellipsoidal, yellowish brown to reddish brown, 22‒30 × 20‒26 µm; wall 1.0‒2.5 µm thick, up to 4 µm at base, echinulate with smooth patches around 2 equatorial germ pores.

Telia on leaves, amphigenous, subepidermal, erumpent, formed initially in uredinia, reddish brown to black.

Teliospores diorchidioid, reddish brown, 34‒42 × 22‒34 µm; wall up to 7 µm thick, smooth, 2-celled, slightly constricted at septum, pedicel collapses.

Hosts
Host family: Poaceae
Host species: Melinis repens

Distribution
NSW, QLD

Comments
Puccinia tricholaenae was first reported from Australia by Langdon and Herbert (1944) (as Diorchidium tricholaenae). It occurs on Melinis repens, which is an invasive African grass. Unpublished molecular analysis has shown that P. tricholaenae has an aecial host on Gomphocarpus fruticosus (Apocynaceae).

Highslide JS
Puccinia tricholaenae on Melinis repens - BRIP 52170.
Scale bar = 1 cm.
Highslide JS
Urediniospores of Puccinia tricholaenae on Melinis repens - BRIP 53644.
Scale bar = 10 µm.
Highslide JS
Teliospores of Puccinia tricholaenae on Melinis repens - BRIP 53644.
Scale bar = 10 µm.