31. The wooded areas have been naturally colonised, with the main trees being silver birch , sycamore and ash. 32. At the elbow, Silver Birch began to labour and Slim Pickings fought back, with McKelvey finishing best. 33. The woodland canopy is mainly oak and silver birch with a shrub layer of hornbeam and hazel. 34. The silver birch is Finland's national tree. 35. More recent winners of both the Welsh and the Aintree Grand National are Bindaree and Silver Birch . 36. One cold night, he led fellow liberation fighters on a training exercise through a forest of silver birches . 37. In 2007 and 2008, O'Brien rode McKelvey in the Grand National, coming second to Silver Birch in 2007. 38. The first Forest of Reading Awards program, the Silver Birch Awards program, was up and running by 1994. 39. It was recorded under silver birch ( " Betula pendula " ) in Manjimup, Western Australia in 2010. 40. To protect the city against future fires, it was decided to plant silver birch trees all over the city.
