Lichen are a special kind of composite organism that results from algae or cyanobacteria living among fungi in a mutualistic relationship. Their different colors usually come from the way they photosynthesize! Write in the earthy colors of lichen with this gel pen 6-pack. 1 mm tips Compatible with Dark Matter Notebooks The colors of these metallic gel pens appear different on black and white paper! Each pack contains 6 unique colors: Firedot Lichen Maritime Sunburst Lichen Gold Dust Lichen Brown Cobblestone Lichen Rough Speckled Shield Lichen Rim Lichen