Urocystis trollii Nannfeldt, 1959
blister-like swellings of the leaves and petioles, containing a black powdery mass of spore balls. Each consists of 2-5 spores, almost entirely covered by numerous sterile cells.
Trollius asiaticus, chinensis, europaeus, hybridus, ranunculinus.
The reference to Ranunculus by Redfern & Shirley probably is mistaken.
Brandenburger (1985), Klenke & Scholler (2015a) , Lotze-Engelhard (2010a), Redfern & Shirley (2011a), Spooner & Leon (2006a), Vanderweyen & Fraiture (2014a), Vánky (1994a), Woods, Chater, Smith ao (2018a).