Lignicolous, living on wood or trees, [366].
Lirella, long narrow apothecium of Graphideae, [158].
Mazaedium, fructification of Coniocarpineae, the spores lying as a powdery mass in the capitulum, [176].
Medulla, the loose hyphal layer in the interior of the thallus, [88] et passim.
Meristematic, term applied by Wainio to growing hyphae, [48].
Microgonidia, term applied by Minks to minute greenish bodies in lichen hyphae, [26].
Multi-septate, term applied to spores with numerous transverse septa, [316 et seq.]
Murali-divided, Muriform, term applied to spores divided like the masonry of a wall, [187].
Oidium, reproductive cell formed by the breaking up of the hyphae, [189].
Oil-cell, hyphal cell containing fat globules, [215].