Juniper Twig Attacked by Gymnosporangium Small 288×320 Medium 577×640 Large 922×1024 Download Tiff Original 2162×2400 | (767.5 KB) Description Gymnosporangium fuscum is a fungus that induces a thickened state of the branches of its host. Keywords fungus, gymnosporangium fuscum, juniper twig, juniper twig attacked by gymnosporangium fuscum Galleries Pine Trees, Trees: I-N Source: Nicholson, George The Illustrated Dictionary of Gardening, Div. VI (London, England: L. Upcott Gill, 1884)