Puccinia coronata on Rhamnus cathartica | Björn S... | Flickr
Puccinia coronata - Wikipedia
Minden Pictures - Crown rust (Puccinia coronata) leaf infection on meadow-grass (Poa sp) - Nigel Cattlin/ FLPA
Frédéric Suffert on Twitter: "Crown #rust on common velvet grass (#Holcus lanatus) likely caused by #Puccinia coronata f. sp. holci, with uredinia releasing uredospores and already some teleutospores (Les Clayes-sous-Bois, FR). https://t.co/0JNlwCdtNI" /