This is a vintage botanical illustration of a lichen. The lichen is depicted as a sprawling, irregular mass, with a base of reddish-brown and a dense covering of bright green, star-shaped structures. These structures appear to be the thallus of the lichen, radiating outwards in a radial pattern. The illustration is detailed, with fine lines and shading used to create texture and depth. In the lower left corner, there's a small, delicate drawing of a grass-like plant with thin, pointed leaves. To the right, a small, rounded patch of green lichen is also illustrated. The illustration is set against a cream-colored background. At the bottom, there's text that reads 'Oct. 1. 1804. Published by T. Sowery, London.'