XX 



GLOSSARY. 



Morel (Morchella) . — A toadstool having a superior hymehium 



of the alveolar type. 

 Morphological. — Relating to the nature and origin of an organ 



or other structure. 

 Morphology. — The study, usually comparative, of the nature 



and origin of plant organs or other parts. 

 Multifoliolate. — Of a compound leaf with many leaflets. 

 Mnltiplets. — Individuals resulting from multiple partition of 



the ovum. 



Mutation. — A form of definite variation in which an entirely 

 new character suddenly arises. 



Mycelium. — Vegetative fungal threads of the substratum, = 

 root of toadstool. 



Needle. — The xerophytic type of foliage-leaf found in Coni- 

 feras and some other plants. 



Node. — The region of the stem where a leaf or leaves are pro- 

 duced. 



Nucellus. — The inner portion of the ovule containing the 



embryo-sac, enwrapped by the integuments. 

 Ochrea. — The membranous tubular structure, of stipular 



nature, which encloses the shoot immediately above the 



leaf in Polygonaceas. 

 Ontogeny. — The history of the individual plant or organ from 



its birth onwards. 

 Oophyte (= gametophyte) . — The sexual plant. 

 Operculum. — The lid or circular covering at the apex of the 



moss-capsule, above the peristome-region. 

 Pampinody. — The change into a tendril. 

 Papilla. — A small rounded outgrowth. 



Paraphyses. — Hair-like growths occurring amongst, and pro- 

 tecting the sexual organs in Thallophy tes. 

 Parenchyma. — Soft-wallecl, non-conducting, living tissue. 

 Paripinnate. — Of a pinnate leaf devoid of terminal leaflet. 

 Peduncle. — The stalk bearing an inflorescence. 

 Peltate. — Shield-shaped. 



Perianth. — (1) A floral envelope in which calyx and corolla 

 are alike in colour and texture ; (2) the floral envelope 

 generally. 



Periblem. — The layer or layers w T hich give rise to the cortex. 

 Perichsetium. — The " perianth " of mosses, i. e. the leaves sur- 

 rounding the sexual organs. 

 Periderm. — Cork. 



Peridium. — The outer envelope of a fungal fructification. 

 Peristome. — The circle of teeth at the apex of the moss-cap- 

 sule which regulates the exit of the spores. 



