Aeciospore

Aeciospores are one of several different types of spores formed by rusts.

[1][2] They each have two nuclei and are typically seen in chain-like formations in the aecium.

[3]

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Light microscopy of Puccinia graminis with an aecium releasing its aeciospores through the broken leaf surface. A=Aeciospore, B=Aecium. Scale bar = 0.1 mm