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Puccinia grevilleae McTaggart & R.G. Shivas

Description
Spermogonia, aecia and uredinia unknown.

Telia on both leaf surfaces, mostly abaxial, erumpent through stomata, formed from basal cells in pseudoparenchyma, up to 350 µm diameter, sometimes in sunken necrotic lesions 200‒500 µm diameter, solitary or gregarious forming aggregated colonies up to 4 mm long.

Teliospores at first ovoid to short cylindrical, hyaline and thick-walled; at maturity short cylindrical or slightly obovoid, pale golden yellow, 39‒65 × 30‒39 µm, wall bilaminate, outer wall thin, hyaline, smooth; inner wall 3‒7 µm thick, slightly thicker at apex, pigmented; germ pore located apically or subapically in upper cell and laterally in lower cell, pedicellate; pedicels hyaline, persistent, up to 150 µm long, mostly 75‒100 µm long on spores released from the telium, 6‒11 µm wide at point of attachment.

Hosts
Host family: Proteaceae
Host species: Grevillea mimosoides

Distribution
QLD

Comments
Two rusts, Puccinia grevilleae and Uredo angiosperma, are recorded from hosts in the Proteaceae from Australia (McTaggart and Shivas 2008). A third rust, P. finschiae, occurs on Finschia chloroxantha (Proteaceae) in Papua New Guinea (Cummins 1961). Puccinia grevilleae is microcyclic, known only from its teliospores, and occurs on Grevillea mimosoides in northern Queensland.

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Puccinia grevilleae on Grevillea mimosoides - BRIP 55600.
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Puccinia grevilleae on Grevillea mimosoides - BRIP 30468.
Scale bar = 1 cm.
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Puccinia grevilleae on Grevillea sp. - BRIP 30469.
Scale bar = 1 mm.
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Teliospores of Puccinia grevilleae on Grevillea mimosoides - BRIP 30468.
Scale bar = 50 µm.
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Teliospores of Puccinia grevilleae on Grevillea mimosoides - BRIP 30467.
Scale bar = 10 µm.