=Endosaprophytism=, term used by Elenkin for destruction of the algal contents by enzymes of the fungus, 36. =Entire=, term applied to the perithecium when completely surrounded by an outer wall, 159. =Epilithic=, growing on the rock surface, 70. =Epiphloeodal=, thallus growing on the surface of the bark, 77. =Epiphyllous=, growing on leaves, 363. =Epithecium=, upper layer of thecium (hymenium), 158. =Erratic lichens=, unattached and drifting, 259. =Exobasidial=, Steiner’s term for sporophore without a secondary sporiferous branch, 200. =Exogenous=, produced externally, as spores on tips of hyphae; see also under thallus. =Fastigiate cortex=, formed of clustered parallel hyphal branches vertical to long axis of thallus, 82. =Fat-cells=, specialized hyphal cells containing fat or oil, 75, 215 _et passim_. =Fibrous cortex=, formed of hyphae parallel with long axis of thallus, 82. =Filamentous=, slender thallus with radiate structure, 101 _et seq._ =Foliose=, lichens with a leafy form and stratose in structure, 82-97. =Foveolae=, =Foveolate=, pitted, 373. =Fruticose=, upright or pendulous thallus, with radiate structure, 101 _et seq._ =Fulcrum=, term used by Steiner for sporophore, 200. =Gloeolichens=, lichens in which the gonidia are _Gloeocapsa_ or _Chroococcus_, 284, 373, 389. =Gonidium=, the algal constituent of the lichen thallus, 20-45 _et passim_. =Gonimium=, blue-green algal cell (Myxophyceae), constituent of the lichen thallus, 52. =Goniocysts=, nests of gonidia in Moriolaceae, 313. =Gyrose=, curved backward and forward, furrowed fruit of _Gyrophora_, 184. =Hapteron=, aerial organ of attachment, 94, 122. =Haustorium=, outgrowth or branch of a hypha serving as an organ of suction, 32. =Helotism=, state of servitude, term used to denote the relation of alga to fungus in lichen organization, 38, 40. =Heteromerous=, fungal and algal constituents of the thallus in definite strata, 13, 68, 305 _et passim_. =Hold-fast=, rooting organ of thallus, 109, 122 _et passim_. =Homobium=, interdependent association of fungus and alga, 31. =Homoiomerous=, fungal and algal constituents more or less mixed in the thallus, 13, 68, 305 _et passim_. =Hymenial gonidia=, algal cells in the hymenium, 30, 314, 315, 327. =Hymenium=, apothecial tissue consisting of asci and paraphyses; cf. thecium, 157. =Hymenolichens=, lichens of which the fungal constituent is a Hymenomycete, 152-154, 342. =Hypophloeodal=, thallus growing within the bark, 78, 364. =Hypothallus=, first growth of hyphae (proto- or pro-thallus) persisting as hyphal growth at base or margin of the thallus, 70, 257 _et passim_. =Hypothecium=, layer below the thecium (hymenium), 157. =Intricate cortex=, composed of hyphae densely interwoven but not coalescent, 83. =Isidium=, coral-like outgrowth on the lichen thallus, 149-151. =Lecanorine=, apothecium with a thalline margin as in _Lecanora_, 158.