This name is a synonym of Psidium salutare var. sericeum (Cambess.) Landrum.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 454416) with original publication details: Abh. Königl. Ges. Wiss. Göttingen 19: 139 1874.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Psidium thea in version 1 of The Plant List.