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Remarks (internal):Puccinia hordei is confirmed in Canada only on Hordeum vulgare, but it attacks wild species in some countries. The sori tend to be smaller even than those of other leaf rusts, justifying the common name dwarf leaf rust, but sorus size is too variable to be relied on as a key character. The accompanying keys compare the cereal leaf rusts, which are all members of the P. recondita clan. 
Description type:Non-original description 
Description:Puccinia hordei Otth, Mitt. Naturf. Ges. Bern 1870: 114. 1871.
= Puccinia hordei Fckl., Jahrb. Nass. Ver. Nat. 27-28:16.1873.
= Uromyces hordei Niels., Ugeskr. Landm. IV, 9(1): 567. 1875.
= Puccinia anomala Rostr. in Thuem., Flora 61: 92.1878.
Pycnia and aecia on Ornithogalum in Europe. In a single specimen from Sweden (S) pycnia amphigenous. Aecia amphigenous, grouped round pycnia. Aeciospores 25-29.5 x 21-24.5 µm; wall 1.0-1.5 µm excluding verrucae, hyaline; verrucae ca. 0.5-0.8 µm high, either 0.2-0.4 µm diam. and crowded, or 0.4-0.8 µm diam. and more widely spaced, larger ones usually pre-dominant, occasionally bizonate but small warts usually in small groups among large ones (± type 2 spores of Savile, Rept. Tottori Mycol. Inst. 10: 225-241, 1973). Uredinia and telia on Hordeum spp., especially H. vulgare. Uredinia amphigenous but often heavier and earlier adaxially than abaxially, small, usually soon naked, bright to brownish yellow, aparaphysate. Urediniospores 23-30(-33) x 18-25 µm; wall 1.0-1.7(-2.0) µm, with pale (or medium) yellow outer layer and thin yellow-brown inner layer; echinulae (0.3-)0.5-0.8(-1.0) µm diam. and (1.0-)1.2-2.2(-2.5) µm between centers; germ pores scattered, (6-)7-11(-13), usually distinct, slight to moderate internal ring, small cap rarely to 1.0 µm high. Telia amphigenous, but larger and more abundant abaxially than adaxially, occasionally on sheaths; usually small, firm, plumbeous from persistent epidermis, often raised on lamina but flat on sheath. Stroma and fused paraphyses heavy and orange-brown to chestnut (cleared in lactophenol); paraphyses 60-70(-80) µm long; stroma above spores combines with paraphyses to form complete locules. Teliospores often mostly one-celled: (21-) 25-49 x 14.5-23 µm. Two-celled spores 33-62 x 16.5-27 µm, slightly constricted, clavate, ellipsoid or irregular, occasionally with 1-3 delicate longitudinal ridges; wall 1.0-1.8 µm min. in lower cell, (subhyaline to) light yellow-brown; 2.5-8 µm at rounded to truncate apex, yellow-brown to chestnut, if truncate often with few bumps to ca. 1.0 µm high; no germ pores; hilum deep yellow to orange; pedicel hyaline to pale yellow except deeper yellow adjoining spore, 12-16(-21) µm long, ± basal.
Host: Hordeum vulgare.
Distribution: Prince Edward Island, Nova Scotia, New Brunswick, Quebec, Ontario, Manitoba, Saskatchewan, British Columbia.
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