The pricky needles of the Austrian pine.
The bark has deep cracks or fissures.
This list gives an indication of the quality as a firewood
Alder fastburning, good firewood.
Birch good , but burns fast
Horse chestnut bad quality firewood, hard to ignite.
Beech very good, but need to be very dry.
Oak very good
Ashvery good firewood
Mulberry very good , but hard to get
monkey puzzle woodbad firewood, don't use it
White poplar smokes, bad firewood
Black locust or Robiniavery good and exspensive.
Walnut good , but hard to get
Larch bad firewood.