Original: Mulberry leaves , particularly those of the white mulberry , are ecologically important as the sole food source of the silkworm ( Bombyx mori , named after the mulberry genus Morus ) , the pupa/cocoon of which is used to make silk .
Simplified: Mulberry leaves , particularly those of the White Mulberry , are also important as food of the silkworm , the cocoon of which is used to make silk .