 Uncultivated heath and moorland cover about a quarter of Exmoor landscape . Some moors are covered by a variety of grasses and sedges , while others are dominated by heather . There are also cultivated areas including the Brendon Hills , which lie in the east of the National Park . There are also 3 @,@ 000 hectares ( 7 @,@ 413 acres ) of forestry commission woodland , comprising a mixture of broad @-@ leaved ( oak , ash and hazel ) and conifer trees . Horner Woodlands and Tarr Steps woodlands are prime examples . The country 's highest beech tree , 350 metres ( 1 @,@ 148 ft ) above sea level , is at Birch Cleave at Simonsbath but beech in hedgebanks grow up to 490 metres ( 1 @,@ 608 ft ) . At least two species of whitebeam tree : Sorbus subcuneata and Sorbus ' Taxon D ' are unique to Exmoor . These woodlands are home to lichens , mosses and ferns . Exmoor is the only national location for the lichens Biatoridium delitescens , Rinodina fimbriata and Rinodina flavosoralifera , the latter having been found only on one individual tree . 
