In the monocotyledonous seeds the endosperm is separated from the embryo by a distinct layer known as 

Testa- Outer covering of seed.

Tegmen- Inner covering of seed.

Aleurone layer- Endosperm is surrounded by a special one- cell thick layer, called aleurone layer.

Scutellum- The embryo consists of an upper shield shaped scutellum which is actually a reduced cotyledon. The scutellum is closely pressed against the endosperm and helps in the translocation of nutrients from endosperm to the growing embryo at the time of germination and seedling growth.