Gymnosporangium cornutum Arthur ex F. Kern 1911

Foodplant / parasite
telium of Gymnosporangium cornutum parasitises live leaf of Juniperus communis
Remarks: season: 4-6
Other: unusual host/prey

Foodplant / parasite
pycnium of Gymnosporangium cornutum parasitises live leaf of Sorbus

Foodplant / parasite
pycnium of Gymnosporangium cornutum parasitises live leaf of Sorbus aucuparia

Foodplant / gall
hypophyllous aecium of Gymnosporangium cornutum causes gall of leaf of Malus domestica
Other: minor host/prey

Gymnosporangium cornutum (Pers.) Arth
Mycologia 1 : 240. 1909.
Aecidium cornutum Pers. in J. F. Gmel. Syst. Nat. 2 : 1472. 1791.
Caeoma cornutum Schlecht. Fl. Berol. 2 : 111. 1824.
Caeoma cylindrttes Link, in Willd. Sp. PI. &^ : 64. 1825.
Gymnosporangium Jun-iperi Link, in Willd. Sp. PI. 6^ ; 127. 1825.
Cefitridium Sorbi Chev. Fl. Paris 1 : 383. 1826.
Gym^no sporangium, aurantiacum Chev. Fl. Paris 1 : 424. 1826.
Roestelia cornuta Fries, Summa Veg. Scand. 510. 1849.
Ceratitium cornutum Rab. Bot. Zeit. 9 : 452. 1851.
Podisoma juniperinum Oerst. Overs. Danske Vid. Selsk. Forh. 1866: 191. 1866.
Pycnia epiphyllous, numerous, gregarious, crowded in groups 1.5-5 mm. across, on discolored areas 3-15 mm. across, prominent, conspicuous, punctiform, honey-yellow becoming blackish-brown.