49 Pa. Code § 15.33
(c) A registrant shall be required to obtain the authorized seal or a rubber stamp, bearing the registrant’s name and registration number and the legend ‘‘Registered Landscape Architect’’ together with a reference to Pennsylvania. A digital seal or rubber stamp identical to the prescribed seal may be obtained and used in lieu of, or in conjunction with, a metal seal.
A sample seal is as follows:

(e) When a registrant seals and signs landscape architectural drawings, reports, documents and other work product, one of the following methods must be used:
The provisions of this § 15.33 amended under section 812.1 of The Administrative Code of 1929 (71 P.S. § 279.3a); and sections 4(9) and 9 of the Landscape Architects’ Registration Law (63 P.S. § § 904(9) and 909).
The provison of this § 15.33 amended May 29, 1992, effective May 30, 1992, 22 Pa.B. 2826; amended July 28, 2006, effective July 29, 2006, 36 Pa.B. 4003; amended December 16, 2022, effective December 17, 2022, 52 Pa.B. 7706. Immediately preceding text appears at serial page (321951).
This section cited in 49 Pa. Code § 15.32a (relating to definitions); and 49 Pa. Code § 15.59 (relating to provisional endorsement licensure).