Which of the following fungi contains hallucinogens?

There is a myth that immediately after heavy rains in forests, mushrooms appear in large numbers and form a very large ring or circle, which may be several metres in diameter. These are called as "fairy rings". Can you explain this phenomenon of fairy rings in biological terms? Discuss the mycelial structure in $Agaricus$ and its soil-borne nature.

Match the class of fungi given in column-$I$ with their common name given in column-$II$ and select the correct option.

Column-$I$ (Class of fungi)	Column-$II$ (Common name)
$A$. Phycomycetes	$I$. Sac fungi
$B$. Ascomycetes	$II$. Algal fungi
$C$. Basidiomycetes	$III$. Fungi imperfecti
$D$. Deuteromycetes	$IV$. Club fungi

Asci are formed in

Mycorrhiza $= .......$

White rust disease is caused by $....$.