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Aecia (Cluster Cups) of Crown Rust of Oats

The cluster cups of Puccinia coronata (causal agent of Crown Rust) are produced on the leaves of Rhamnus cathartica ( Buckthorn).  The organization of this cup is similar to thatof Puccinia graminis.   To see the microscopic details in organization of a cluster cup of Puccinia graminis click here.