"Nepenthes albomarginata" gains its name from the ring of white trichomes directly beneath the peristome. The circular area bordering the peristome is a paler color. Two fringed wings run from the tendril attachment to the lower edge of the peristome. It has a curved anterior apex that is over the peristome. The peristome is cylindrical in cross section and widens towards the rear. Embedded in the peristome are five calcareous "teeth" collectively known as Aristotle's lantern. The mouth of the capsule is usually ringed by a set of teeth called peristome. An outward-curving peristomial disc is associated with the peristome. The aperture or peristome of the shell may be simple or variously modified. There are a few mosses in the Bryopsida that have no peristome in their capsules. "echinostoma", is endemic to Brunei and Sarawak and possesses an extremely wide peristome. The peristome is green to dark red and striped with purple bands. There are two subtypes of arthrodontous peristome. There are two basic arthrodontous peristome types. The peristome is generally not continuous.