Before revision: Some series which superficially resemble exsiccatae as those of William Gardiner with the title Twenty lessons on British Mosses; first steps to a knowledge of that beautiful tribe of plants ... illustrated with specimens are primarily books for educational purposes and .
After revision: Some works as that of William Gardiner with the title Twenty lessons on British Mosses; first steps to a knowledge of that beautiful tribe of plants ... illustrated with specimens with mounted herbarium specimens are primarily for educational purposes .