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    • Gymnosporangium
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Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves and petioles and stems of hawthorn (Crataegus monogyna), Berkshire, UK. May.
01736544
Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves and petioles and stems of hawthorn (Crataegus monogyna), Berkshire, UK. May.
Hawthorn juniper rust (Gymnosporangium sp.) rust pustule swelling on the stem and spike of Hawthorn (Crataegus monogyna), Berkshire, UK. May.
01736543
Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustule swelling on the stem and spike of Hawthorn (Crataegus monogyna), Berkshire, UK. May.
Hawthorn juniper rust (Gymnosporangium sp.) rust pustules lesion and aecial horns forming on upper leaf of Hawthorn (Crataegus monogyna), Berkshhire, UK. May.
01736542
Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules lesion and aecial horns forming on upper leaf of Hawthorn (Crataegus monogyna), Berkshhire, UK. May.
Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves, petioles and stems of Hawthorn (Crataegus monogyna), Berkshire, UK. May.
01736541
Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves, petioles and stems of Hawthorn (Crataegus monogyna), Berkshire, UK. May.
Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on flower and peduncle of Hawthorn (Crataegus monogyna), Berkshire, UK. May.
01736540
Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on flower and peduncle of Hawthorn (Crataegus monogyna), Berkshire, UK. May.
Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves, petioles and stems of Hawthorn (Crataegus monogyna), Berkshire, UK. May.
01736539
Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves, petioles and stems of Hawthorn (Crataegus monogyna), Berkshire, UK. May.
Juniper-apple rust (Gymnosporangium juniperi-virginianae) on Virginian juniper (Juniperus virginiana) tree, Morris Arboretum, Pennsylvania, USA. May.
01719010
Doug Wechsler / Juniper-apple rust (Gymnosporangium juniperi-virginianae) on Virginian juniper (Juniperus virginiana) tree, Morris Arboretum, Pennsylvania, USA. May.
European pear rust (Gymnosporangium sabinae) growth blister producing aeciospores on the lower surface of a pear leaf, Berkshire, UK, September.
01685797
Nigel Cattlin / European pear rust (Gymnosporangium sabinae) growth blister producing aeciospores on the lower surface of a pear leaf, Berkshire, UK, September.
European pear rust (Gymnosporangium sabinae) lesions on the upper surface of a pear leaf, Berkshire, UK, September.
01685796
Nigel Cattlin / European pear rust (Gymnosporangium sabinae) lesions on the upper surface of a pear leaf, Berkshire, UK, September.
Cedar apple rust (Gymnosporangium juniperi-virginianae) pustules on the underside of an apple leaf, New York, USA, September
01677660
Nigel Cattlin / Cedar apple rust (Gymnosporangium juniperi-virginianae) pustules on the underside of an apple leaf, New York, USA, September
Cedar apple rust (Gymnosporangium juniperi-virginianae) lesions on the upper leaf surface of an apple leaf, New York, USA, September
01677659
Nigel Cattlin / Cedar apple rust (Gymnosporangium juniperi-virginianae) lesions on the upper leaf surface of an apple leaf, New York, USA, September
Cedar apple rust (Gymnosporangium juniperi-virginianae) pustules on the underside of an apple leaf, New York, USA, September
01677658
Nigel Cattlin / Cedar apple rust (Gymnosporangium juniperi-virginianae) pustules on the underside of an apple leaf, New York, USA, September