The rust fungus Gymnosporangium confusum produces pronounced growths (telial fruit-bodies) on the live wood of cultivated Juniper species such as Juniperus sabinae. These growths are dark brown when dry but swell and become lighter and more orange coloured when wet.
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On cultivated Juniper species (using pear and hawthorn as alternative host)
Fruiting bodies on Juniper appear in late spring or summer.
Gymnosporangium confusum uses garden pear trees as an alternative host but also favours hawthorn.
It appears to be occasional, but widespread in Britain but it is unclear whether it is rather uncommon or just under recorded.
Rare or rarely recorded in Leicestershire and Rutland where there are few records.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015