Stratose thallus, where the tissues are in horizontal layers, [70].
Stratum, a layer of tissue in the thallus, [70].
Symbiont, one of two dissimilar organisms living together, [32].
Symbiosis, a living together of dissimilar organisms, also termed commensalism, [31, 32 et seq.]
Tegulicolous, living on tiles, [369].
Terebrator, boring apparatus, term used by Lindau for the lichen “trichogyne,” [179].
Thalline margin, an apothecial margin formed of and usually coloured like the thallus; [cf. amphithecium].
Thallus, vegetative body or soma of the lichen plant, [11], [421]. Endogenous thallus in which the alga predominates, [68]. Exogenous thallus in which the fungus predominates, [69].
Theca, enlarged cell containing spores; [cf. ascus].
Thecium, layer of tissue in the apothecium consisting of asci and paraphyses; [cf. hymenium], [157].