The superintendent or person in charge of the county psychiatric hospital may admit and provide care and treatment in the hospital for any person who comes within the following descriptions:
(a) Who voluntarily makes a written application as provided in Chapter 1 (commencing with Section 6000) of Part 1 of Division 6 of this code.
(b) Who is a conservatee and has written application made in his behalf by his conservator.
(Added by Stats. 1967, Ch. 1667.)