Puccinia antirrhini
Spermogonia and aecia unknown.
Uredinia mostly hypophyllous, abundant, scattered, 300-900 µm diam., ± circular, surrounded by the ruptured epidermis, pulverulent, chestnut-brown. Urediniospores 16-24 x 21-30 µm, globose to ellipsoidal or slightly obovoid, the wall pale chestnut-brown, 1.5-2.5 µm thick, shortly echinulate, with 2 (-3) equatorial germ pores.
Telia usually hypophyllous, usually sparse and present only at the end of the season, on pale spots with the host tissue becoming desiccated, scattered or confluent, 500-1000 µm diam., circular, surrounded by the ruptured epidermis, pulvinate, blackish brown. Teliospores 36-54 x 17-26 µm, cylindrical to ellipsoidal, the base obtuse, the apex rounded to truncate, slightly constricted at the ± median septum and narrowed below, the wall 1.5-2.5 µm thick laterally, to 12 µm thick at the apex, smooth. Pedicel subhyaline, ± equal in length to the spore, persistent.
Assessed for Wales by Woods et al. (2015) as of Least Concern, not formally assessed on a UK-wide basis but the likely outcome would be the same. The species is reported to be introduced, but has spread widely.
On living leaves of Antirrhinum species, most commonly found on A. majus in GB&I but also reported on A. molle. Telia are apparently not produced on A. majus.
Widely distributed in Great Britain and Ireland as far north as Yorkshire and the Isle of Man, with very few reports from Scotland. 224 records in FRDBI (accessed Feb 2017).