Analysis, Spectra and Number Theory, a Conference in Honor of Peter Sarnak’s 61st Birthday

(Joint with O. Imamoglu and A. Toth) I will describe some recent work on an apparently overlooked $PSL(2,\Z)$ equidistribution problem, namely that for positive fundamental discriminants that can be written as the product of two co-prime negative discriminants. The geometric interpretation of this case is rather different than the usual equidistribution of modular closed geodesics.