xx GLOSSARY 



Discoid, disc-like, an open rounded apothecium, 156. 



Discolichens, in which the fructification is an apothecium, 160 et seq. 



Dual hypothesis, the theory of two organisms present in the lichen thallus, 27 et seq. 



Effigurate, having a distinct form or figure ; cf. placodioid, 80, 201. 



Endobasidial, Steiner's term for sporophore with a secondary sporiferous branch, 200. 



Endogenous, produced internally, as spores in an ascus, 179; see also under thallus. 



Endolithic, embedded in the rock, 75. 



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, 1 59. 

 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 Gyrophor>i, 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. 







