1) Provascular tissue 
• (n.) The young tissue of a fibrovascular bundle before its component cells have begun to be differentiated.
(from the article `plant development`) ...stem and the root are terminal meristems. In the stem apex, the uppermost part is the promeristem, below which is a zone of transversely oriented ... ...outermost protoderm differentiates into the epidermis, a tissue that protects the plant; the adjacent ground meristem differentiates into the ....
In vascular plants, a primary meristematic tissue that gives rise to primary vascular tissues.
<plant biology> Plant meristem that gives rise to the primary vascular system. ... (18 Nov 1997) ... 
Plant meristem that gives rise to the primary vascular system.
Pro·cam'bi·um noun [ New Latin See Pro- , and Cambium .] (Botany) The young tissue of a fibrovascular bundle before its component cells have begun to be differentiated. Sachs. 
the meristem from which vascular bundles are developed. Also called