Coprophilous fungi belong to which class?

Dikaryon formation is the characteristic feature of

$A$ specimen of fungus is brought by a student for identification. Upon close examination,he discovered that its hyphae are completely septate and it has gills on the underside of the pileus. To which fungal group does it most likely belong?

What is the shape of a perithecium?

In which of the following is the sexual cycle absent?

$A$: Secondary mycelium of $Agaricus$ is binucleated.
$R$: Secondary mycelium is formed by somatogamy of primary mycelium.