What is the mycelium composed of?

Assertion $(A)$: In bread mold $(Rhizopus)$,sexual reproduction does not result in the formation of an embryo.
Reason $(R)$: In sponges $(Porifera)$,the cell wall is made of cellulose.

Which of the following is an edible mushroom?

Select the incorrectly matched pair.

Assertion : $Neurospora$ is commonly called water mould.
Reason : It belongs to basidiomycetes fungi.

Plant diseases caused by $Ustilago$ fungus are called $SMUTS$ because