GLOSSARY. 
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Acicular. Slender or needle-shaped, as the spores in Bacidia. 
Adnate. As applied to the apothecium, attached to the thallus or substratum by the 
whole lower side. (Fig. 16, p. 232.) 
Amphithecium. A layer of tissue continuing upward from the hypothecium in some 
angiocarpic lichens and nearly surrounding the hymenium. (Fig. 18, p. 243.) 
Angiocarpic. Having the hymenium inclosed by a perithecium, by an amphithe- 
cium, or by both structures. (Fig. 17, p. 239.) 
Apothecium. The spore-bearing organ, consisting of the hymenium, the epithecium, 
the hypothecium, and the exciple or exciples. 
Areole. A small polygonal area of a lichen thallus, separated from other similar 
areas by a minute chink. (PI. 8, B, facing p. 100.) 
Ascogenous. Ascus-producing. 
Ascus. A specialized hyphal cell in which the spores are produced. (PI. 3, facing 
p. 63.) 
Autonomy. An individual. 
Biatoroid, Resembling the Lecideas of the section Biatora: used specifically of 
apothecial structure. 
Cephalodium. A small, regular or irregular growth appearing on the surface of a few 
lichen thalli, containing algal cells and fungal hyphe, usually inclosed finally 
in cellular cortex. (Pl. 29, facing p. 159.) 
Ciium. A slender filament, composed of a bundle of hyphe, occurring on the upper 
surface or along the margin of the thallus. 
Cortex. Pseudoparenchyma forming upper and lower protective layers in many 
lichen thalli. (Fig. 12, p. 156.) 
Crustose. As applied to some lichen thalli, crust-like, or closely attached to the sub- 
stratum and without distinct cortex. (PI. 49, B, facing p. 235.) 
Cyphella. A minute depression in the under surface of certain lichen thalli. (Pl. 26, 
facing p. 154.) 
Dermis. In some lichens a distinctly marked layer above the upper cortex consisting 
of flattened cells. (Pl. 9, facing p. 101.) 
Difform. Irregular in form, as certain apothecia. (PI. 2, B, facing p. 54.) 
Ectotrophic. Lying on the surface of the thallus. (PI. 29, facing p. 159.) 
Ellipsoid. In the form of an ellipse, or oblong with much rounded ends. 
Endotrophic. Within the thallus. 
Epilithic. Upon rocks. 
Epiphleodal. Upon the bark. 
Epithecium. A structureless thalloid remnant lying upon the hymenium. 
Exeiple. A layer surrounding the hymenium laterally and sometimes produced 
into a perithecium, (Fig. 14, p. 178.) 
Exosporium. The outer coat of the spore wall. (Pl. 3, facing p. 63.) 
Farinose. Covered with a mealiness. 
Flexuous. Said of exciples or apothecia and meaning that the margin of the apothe- 
cium, or the exciple, is not circular, but bent alternately in and out and thus 
irregular in outline, 
Foliose. Flat and more or less leaf-like; applied to thalli. (Pl. 28, facing p. 157.) 
Fruticose. Shrub-like in form; applied to thalli. (Pl. 39, facing p. 203.) 
Gelatinized. ‘Transformed into a jelly-like mass. 
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