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Puccinia mixta Fuckel

Description
Uredinia on leaves, subepidermal, erumpent, linear.

Urediniospores globose, subglobose, ellipsoidal or obovoid, subhyaline, 26‒32(‒36) × 22‒26(‒28) μm; wall 1.5‒2.5 μm thick, echinulate, 22‒31 spines per 10 μm2, with 6‒12 scattered germ pores.

Telia on leaves, subepidermal, not erumpent, ellipsoidal to linear, confluent, black.

Teliospores cylindrical or clavate, apex rounded to truncate, mostly two-celled (80‒90 %)
with remainder one-celled, reddish brown, smooth walled; one celled spores ovoid to obovoid or irregular 24‒32 × 16‒21 μm, wall 1.5‒3.0 μm thick at sides, apex not thickened; two-celled spores cylindrical to obovoid 31‒57 × 15‒23 μm, upper cell similar in length or slightly shorter than lower cell, wall 1.5‒3.0 μm thick at sides, not thickened or slightly thickened at apex.

Hosts
Host family: Alliaceae
Host species: Allium schoenoprasum

Distribution
NSW

Comments
Puccinia mixta is distinguished from other rusts on species of Allium by its teliospores with non-thickened apices and a specific host range on Allium schoenoprasum. It has not been collected in Australia since 1971, and may be considered absent.

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Puccinia mixta on Allium schoenoprasum - BRIP 61556 (specimen from Netherlands).
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Puccinia mixta on Allium schoenoprasum - BRIP 59724 (specimen from Netherlands). Scale bar = 1 mm.
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Urediniospores of Puccinia mixta on Allium schoenoprasum - BRIP 61577 (specimen from Germany).
Scale bar = 10 µm.
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Teliospores of Puccinia mixta on Allium schoenoprasum - BRIP 61576 (specimen from Germany).
Scale bar = 10 µm.