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Oxalis triangularis A. St.-Hil. (Oxalidaceae) known as “False Shamrock”, is a perennial ornamental plant
native to Brazil. The plant is used as indoor pot plant in Iran. In June 2018, rust-infected leaves were
sampled from an indoor pot plant in University of Maragheh, located in Maragheh, East Azarbaijan. The
following morphological features were observed on infected leaves:
Spermogonia and aecia not seen. Uredinia round, 0.2-0.4 mm in diameter, in orbicular groups forming
concentric circles up to 9 mm in diameter, soon naked, erumpent, powdery, yellowish white to orangeyellow, without paraphyses, urediniospores 16-23 × 13-19 µm, ellipsoid, globoid or obovoid, wall 0.5-1(1.5)
µm thick, minutely and densely echinulate, colorless, germ pores obscure. Telia not seen, teliospores were
sporadically present in uredinia, 21-28 × 15-18 µm, ellipsoid, oblong or broadly oblong, rounded or obtuse at
apex, slightly constricted at septum, wall quite colorless, smooth, thin, 0.5-0.8 µm, pedicel colorless, as long
as spores or shorter (Fig. 1). The above features fit well with those of Puccinia oxalidis Dietel & Ellis
(Arthur 1920). This rust species originally described from Mexico and has been reported from tropical and
subtropical America from Argentina to the United States on several species of Oxalis. The rust has also been
introduced into Canada, Australia, New Zealand, Hawaii, Madeira Islands, China, India, Nepal, Japan,
United Kingdom, Azores, Canary Islands and Uganda (Farr & Rossman 2018). There is a recent report of P.
oxalidis on O. triangularis subsp. papilionaceae cv. Atropurpurea from Czech Republic (Šafránková 2014).
Puccinia bakshii A.B. De, is another Puccinia species producing uredinial and telial states on Oxalis (De
1997). The fungus published invalidly due to article 40.7 (Melbourne code). However, it differs from P.
oxalidis in having epiphyllous uredinia and telia and smaller urediniospores and teliospores. There is at least
one confirmed report from Unite
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