This section is from the book "Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc.", by George Francis Atkinson. Also available from Amazon: Studies of American Fungi: Mushrooms, Edible, Poisonous, Etc..
The genus Merulius has a fruiting surface of irregular folds or wrinkles, forming shallow, irregular pits instead of a deeply honeycombed surface. Merulius lacrymans ( Jacq.) Fr., the "weeping" merulius, or "house fungus," often occurs in damp cellars, buildings, conduit pipes, etc. It is very destructive to buildings in certain parts of Europe (see Figs. 189, 190). Merulius tremellosus Schrad., is very common in woods during autumn. It is of a gelatinous consistency, and spread on the under surface of limbs or forms irregular shelves from the side (see Figs. 191, 192).
Merulius lacrymans. Figure 189. - Upper plant in conduit pipe leading from wash room, Gymnasium C. U., Autumn, 1899. Figure 190. - Lower plant from under surface decaying hemlock spruce log in woods near Freeville, N. Y., October, 1899. Margin of plants white, fruiting surface a network of irregular folds, golden brown, or brown. Copyright.
Merulius tremellosus. Figure 191. - Natural size.
Enlarged to show character of fruiting surface. Fruiting surface yellowish; margin and upper surface in shelving forms, while, hairy. Copyright.
Plate 75, Figure 193
Phlebia merismoides. On rotting log, woods near Ithaca, November 23, 1898 (No. 2634 C. U. herbarium). Various shades of orange, yellow or yellow brown when old. Copyright.
Plate 76, Figure 194
Phlebia merismoides. Portion' of a plant 2 1/2 times natural size, to show interrupted folds of fruiting surface. For colors see Fig. 193. Copyright.