Puccinia praecox Bubák, 1898
Crepis biennis, urediniospores (from Gäumann, 1959a)
No host plant alternation. Aecia hypophyllous, cupulate, yellow with recurved margin, on yellow spots, often on the leaf tips and already in March. Uredinia from May on, chocolat brown on yellow spots. Urediniospores 20-29 x 22-33 µm, with 2 (less often 3) mostly equatorial pores. Telia from August, almost black; spores (19)26(31) x (27)33(49) µm, two-celled, finely verrucose, on short, deciduous pedicels.
Crepis biennis, capillaris, foetida & subsp. rhoeadifolia, nicaeensis.
C. biennis is the most mentioned host plant.
Brandenburger (1985a), Buhr (1964b), Gäumann (1959a), González Fragoso (1924a), Jage, Scholler & Klenke (2010a), Klenke & Scholler (2015a), Kruse (2014a, 2019a), Marková & Urban (1988a), Poelt & Zwetko (1997a), Scheuer & Bechter (2012a), Termorshuizen & Swertz (2011a), Tomasi (2014a).