Plant Parasites of Europe

leafminers, galls and fungi

Gymnosporangium tremelloides

Gymnosporangium tremelloides Hartig, 1882

on woody Rosaceae


Aecia on reddish brown spots, some 3 mm large, on the underside of the leaves. The species stands apart by its large aeciospores: 25-35 × 30-50 µm.


woody Rosaceae (Maloideae), oligophagous

Cydonia oblonga; Malus domestica, sylvestris; Pyrus communis; Sorbus aria, aucuparia, chamaemespilus, latifolia, tormialis.

on Juniperus

Juniperus communis, Loenen (Ge.) © Arnold Grosscurt


Telia on the older branches, when moist yellow cushions, dry more like large scales, always much broader than high. Teliospores two-celled, with 3 germination pores in the upper, 2 in the lower cell, all without a papilla.

host plants

Cupressaceae, monophagous

Juniperus communis & var. saxatilis, oxycedrus.


Bahcecioglu & Kabaktepe (2012a), Blumer (1946a), Brandenburger (1985a: 29), Buhr (1964b), Doppelbaur & Doppelbaur (1973a), Erdoğdu, Hüseyin & Suludere (2010a), Gäumann (1959a), Helfer (2005a), Klenke & Scholler (2015a), Negrean (1997a), Poelt & Zwetko (1997a), Termorshuizen & Swertz (2012a), Zhao, Liu, Li & Cai (2016a).

Last modified 10.viii.2018