=Radiate thallus=, the tissues radiate from a centre, 98 _et seq._
=Rhagadiose=, deeply chinked, 74; cf. rimose.
=Rhizina=, attaching “rootlet,” 92-94.
=Rimose=, =Rimulose=, cleft or chinked into areolae, 73.
=Rimose-diffract=, widely cracked or chinked, 74.
=Scutellate=, shaped like a platter, 156.
=Scyphus=, cup-like dilatation of the podetium, 111, 117.
=Signature=, a term in ancient medicine to signify the resemblance of a
plant to any part of the human body, 406, 409.
=Soralium=, group of soredia surrounded by a definite margin, 144.
=Soredium=, minute separable particle arising from the gonidial tissue of
the thallus, and consisting of algae and hyphae, 141.
=Spermatium=, spore-like body borne in the spermogonium, regarded as a
non-motile male cell or as a pycnidiospore, 201.
=Spermogonium=, roundish closed receptacle containing spermatia, 192.
=Sphaeroid-cell=, swollen hyphal cell, containing fat globules, 215.
=Squamule=, a small thalline lobe or scale, 74 _et passim_.
=Sterigma=, Nylander’s term for the spermatiophore, 197.
=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.
=Trichogyne=, prolongation of the egg-cell in Florideae which acts as a
receptive tube; septate hypha in lichens arising from the ascogonium,
160, 177-181, 273.
=Woronin’s hypha=, a coiled hypha occurring in the centre of the fruit
primordium, 159, 163.
ERRATA
p. 24. _For_ Baranetsky _read_ Baranetzky.
p. 277. For _Ascolium_ read _Acolium_.
p. 318. For _Lepolichen coccophora_ read _coccophorus_.
Transcriber’s Note: The errata have been corrected.
INTRODUCTION
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