
1) Quercus petraea 2) Quercus sessiliflora 3) White oak
Found on
https://www.crosswordclues.com/clue/durmast

Durmast is a species of oak, Quercus sessiliflora, or according to some, Quercus pubescens, so closely allied to the common oak (Quercus robur) as to be reckoned only a variety of it. Its wood is, however, darker, heavier, and more elastic, less easy to split, not so easy to break, yet the least difficult to bend. It is highly
Found on
http://www.probertencyclopaedia.com/browse/BD.HTM

[
n] - deciduous European oak valued for its tough elastic wood
Found on
http://www.webdictionary.co.uk/definition.php?query=durmast
Quercus petraea noun deciduous European oak valued for its tough elastic wood
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.