Betula utilis of the tree's native distribution, several forms have orange- or copper-colored bark. "Betula utilis" var. "jacquemontii", from the western end of the native habitat, is widely used because several cultivars have especially white bark. These include: Those cultivars marked have gained the Royal Horticultural Society's Award of Garden Merit. "B. utilis" 'Fascination' has an orange- to mahogany-colored bark, which peels off to reveal a polished-looking layer underneath. The bark of 'Wakehurst Place Chocolate', as the name implies, is dark brown to nearly black. Betula utilis Betula utilis (Himalayan birch, bhojpatra, "bhūrjá") is a birch tree native to the Himalayas, growing
Pteryx Pteryx Pteryx is a genus of beetles that is typically found in northern bogs in the Northern Hemisphere. They belonging to the family Ptiliidae which is referred to as feather-winged beetles as the hindwings are narrow and feather-like. Like most of the rest of the family, "Pteryx" are very small and live in rotting vegetative matter. They prefer rotting wood and are generally found under the bark of rotting logs or stumps. The "Pteryx" are less than 1 mm in length. They are polymorphic, in that they frequently occur in two forms, a normal variety, and a neonate form that