Uromyces festucae-nigricantis Gonzalez-Fragoso, 1914
spermogonia in small groups, amphigenous. Aecia hypophyllous, in compact groups, cupulate with recurved margin split into segments,
Aecia on Ranunculus of this type can belong to several species; identification on the basis of morphological characters is virtually impossible. By way of an emergency solution they are collectively addressed as Aecidium ranunculi-acris.
Ranunculaceae, narrowly monophagous
Supposed (!) hostplant.
uredinia and telia mainly hypophyllous, on yellow leaf spots. Uredinia soon naked, pulverulent, bright rust-coloured; spores 18-22 x 20-6 µm, with 3-5, sometimes more, germination pores. Telia compact, blackish brown; teliospores one-celled on a persistent pedicel of 14-24 µm.
Poaceae, narrowly monophagous
Festuca melanopsis (= nigricans).
Brandenburger (1985a: 761), Gäumann (1959a), González-Fragoso (1925a), Klenke & Scholler (2015a).