Mull has over 800 species of vascular plant (684 native and 171 naturalised) including 33 species of fern, at least 18 species of orchid and 22 native species of tree. There are about 700 species of lichen, 571 liverworts and mosses, and 247 marine algae (seaweeds), making a total of 2,388 species of plant recorded from the island. In addition, more than 2,000 species of fungi have been recorded on Mull: Dennis and Watling write, "When one speaks of the Inner Hebridean fungi one is referring to the floras of Mull and Rhum".