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hig APPENDIX 
GLOSSARY 
Acervulus (acervuli). Open, saucer-shaped, asexual fruiting body. 
See pyenidium. 
Zciospore (eciospores). Spore borne in an ecium. 
cium (cia). Type of fruit-body in rusts. 
Annulus (annuli). A ring-like portion of a mushroom veil, remaining 
attached to the stem after its rupture and after the expansion of the 
cap, or pileus. ; 
Apothecium (apothecia). Open, cup-shaped, sexual fruit-body. 
See perithecium. 
Appressorium (appressoria). Hold-fast, or organ of attachment de- 
veloped by certain fungi. 
Ascospore (ascospores). Spore borne in an ascus. See ascus. 
Ascus (asci). Sexual spore-containing sac, usually developed within 
an apothecium or a perithecium. 
Bacterium (bacteria). A simple plant of low order lacking chlorophyl, 
or leaf-green. It has no mycelium and each plant is but a single 
cell. Reproduction by fission. Spores sometimes produced. 
See fungus. 
Calyx (calyces). Outer series of leaves of a flower, usually green. 
Cambium. The growing and formative tissue of a stem or root, found 
between the wood and bark. 
Canker. A definite dead area in the bark of trees or shrubs. 
Cap. See pileus. 
Chlamydospore. Thick-walled asexual spore which usually is capable 
of resting. 
Chlorophyl. Green coloring-matter in leaves. 
Cilium (cilia). Thread-like process on bacteria or motile spores which 
aids in motility. 
Conidiophore. A spore-bearing stalk. 
Conidium (conidia). Asexual spore. 
Cortex. Outer bark. 
Crenulate. Finely notched. 
Cuticle. A continuous waxy film covering the surface of plants. 
Enphytotic. Said of a plant disease which is habitually and perma- 
nently prevalent in a locality, although not unusually destructive. 
See epiphytotic. 
Enzyme. A chemical compound capable of assisting or hastening chemi- 
eal transformation, but without itself entering into the final product. 
Epiphytotic. Said of a plant disease which suddenly appears in a 
locality in an unusually destructive manner. See enphytotic. 
Fungus (fungi). A simple plant of low order lacking chlorophyl, or 
leaf-green. It has mycelium which corresponds to roots. Repro- 
duction by means of spores. See bacterium. 
