Gymnosporangium libocedri

Gymnosporangium libocedri, the Pacific Coast pear rust, is a plant pathogen and rust fungus.^[1] It produces orange gelatinous growths (telia) on incense cedar in the spring. Its secondary hosts include apple, crabapple, hawthorn, mountain ash, pear, quince, and serviceberry.

'brooming' on Calocedrus decurrens

Gymnosporangium libocedri
Gymnosporangium libocedri on serviceberry fruits
Scientific classification
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Pucciniomycetes
Order:	Pucciniales
Family:	Gymnosporangiaceae
Genus:	Gymnosporangium
Species:	G. libocedri
Binomial name
Gymnosporangium libocedri (Henn.) F. Kern (1908)

Gymnosporangium libocedri on incense cedar (Calocedrus decurrens)