Aeciospores are one of several different types of spores formed by Rusts. They each have two nuclei and are typically seen in chain-like formations in the Aecium. ... Found on http://en.wikipedia.org/wiki/Aeciospore
A dikaryotic 'transfer' spore of the Uredinales, formed in an aecium on the alternate host in macrocyclic rusts and infecting only the primary host; spores of Stage I in heteroecious or autoecious rusts. Found on http://ppathw3.cals.cornell.edu/glossary/Defs_A.htm