Pine forests (with "Pinus sylvestris") are the most widespread and occupy 51% of the forested area of the Karelian Isthmus, followed by spruce forests (with "Picea abies", 29%) and birch forests (with "Betula pendula" and "B. pubescens", 16%). Stands on more fertile soils and in more favorable locations are occasionally dominated by Norway maple, black alder, grey alder, common aspen, English oak, grey willow, dark-leaved willow, tea-leaved willow, small-leaved lime or European white elm. Common vegetation of various types of pine forests includes heather, crowberry, common juniper, eared willow, lingonberry, water horsetail, bracken, graminoids (i.e. grasses in the wider sense) "Avenella flexuosa" and "Carex globularis", mosses "Pleurozium schreberi", "Sphagnum angustifolium" and "S. russowii", and lichens "Cladonia" spp. Prominent in various spruce forests are wood horsetail, common wood sorrel, bilberry, lingonberry, graminoids "Avenella flexuosa", "Calamagrostis arundinacea", "Carex globularis", and mosses "Polytrichum commune" and "Sphagnum girgensohnii". Prominent vegetation of various birch forests include meadowsweet, common wood sorrel, bilberry and graminoids "Calamagrostis arundinacea" and "C. canescens".