1679. Evelyn, Sylva (ed. 3), 29. That … the sap should be so green on the indented leaves,… so Suberous in the Bark (for even the Cork-tree is but a courser Oak).
1776. J. Lee, Introd. Bot., Explan. Terms 379. Suberosus, suberous, the outward Bark soft, but elastic like Cork.
1849. Balfour, Man. Bot., § 85. In some trees it [sc. the epiphlœum] consists of numerous layers, forming the substance called cork…; hence the name suberous, or corky layer, which is given to it.
1884. Bower & Scott, De Bary’s Phaner., 550. Two forms of the superficial formation of cork may be distinguished…: namely, suberous crusts and suberous integuments.
