Section 101. Before being examined for registration as a landscape architect, each applicant shall submit evidence to the board that:

(a) he is at least twenty-three years of age and of good moral character;

(b) he is a citizen of the United States or has legally declared his intention of so becoming;

(c) he has completed the course of study and been graduated from a college or school of landscape architecture approved by the board and that he has had two years of practical experience in landscape architectural work of a grade and character satisfactory to the board. In lieu of graduation from an approved college or school of landscape architecture, and the practical experience in addition thereto, an applicant may take the examination upon presenting evidence of at least six years of practical experience in landscape architectural work of a grade and character satisfactory to the board. Credit may be given for approved college education at the discretion of the board.

Notwithstanding the provisions of the preceding paragraph, any individual who has been employed by the commonwealth in the title of landscape architect, for a period of two years who is a graduate of a college or school of landscape architecture approved by the board shall meet the requirements of clause (c).

Nothing herein shall be construed to prevent a firm, partnership or corporation from using the title ''landscape architect'' or ''landscape architects'', or similar title provided that the practice of landscape architecture by such firm, partnership or corporation shall be under the professional and supervisory control of a person registered as a landscape architect.