Urocystis floccosa (Wallroth) Henderson, 1955

on Helleborus

gall

up to several cm large, greyish-brown, blister-like swellings on the (often disfigured) leaves, petioles and stems that, upon rupturing, release a black, powdery-granular mass of spore balls. The spore balls consist of 1-3 spores, surrounded by a limited number of sterile cells.

host plants

Ranunculaceae, monophagous

Helleborus dumetorum, foetidus, multifidus & susp. macranthus, niger, odorus & subsp. cyclophyllus, purpurascens, viridis.

synonyms

Tuburcinia hellebori-viridis (de Candolle) Liro, 1922.

references

Almaraz (1998a), Brandenburger (1985a), Buhr (1964b), Dauphin & Aniotsbehere (1997a), Ivić, Sever, Scheuer & Lutz (2013a), Klenke & Scholler (2015a), Lotze-Engelhard (2010a), Lutz & Vánky (2009a), Redfern & Shirley (2011a), Scholz & Scholz (2013a), Vanderweyen & Fraiture (2014a), Vánky (1994a) Zwetko (1993a).