The brown rust infecting Agropyrum species in Czechoslovakia consists of two ecologically and morphologically distinct units, proposed as Puccinia persistens subsp. persistens var. persistens and subsp. agropyrina comb. nov. Rust on wheat is treated as var. triticina.
Hubálek Z. (1976): Occurrence of keratinolytic fungi in nests of Tree Sparrow (Passer montanus L.) in relation to the to the substrate moisture. – Česká Mykologie 30(2): 106–109.