GLOSSARY. 



XIX 



Hypertrophy. — The excessive development of an organ or part. 



Hypoascidium. — An ascidium whose inner surface is morpho- 

 logically the lower one of the leaf. 



Hypocotyl. — The portion of the axis of a seedling intervening 

 between cotyledons and radicle. 



Hypogseal (of cotyledons). — Remaining- below the ground. 



Imparipinnate . — Of a pinnate leaf with a terminal leaflet. 



Inflorescence. — In the higher plants, a part of the stem 

 differentiated to bear flowers; in Bryophytes, a portion 

 of the thallus differentiated to bear the sexual organs. 



Interfascicular. — Occurring between the vascular bundles. 



Internode. — The region of the stem between any two nodes. 



Invagination. — An infolding of tissues towards the centre. 



Involucre. — The aggregation of bracts below the congested 

 inflorescence of Compositas, Umbelliferse, etc. 



Knaur (burr). — The swollen excrescences occurring on the 

 trunks of some trees. 



Laciniation. — Lateral splitting or division. 



Lamella. — The gill of an Agaric ; the thin laminar outgrowth 

 from a leaf-surface. 



Lamina. — A leaf -blade. 



Lenticel. — The breathing-pore of a stem or root. 

 Ligule. — An outgrowth from the upper surface of the leaf- 

 base. 



Lobing. — Leaf-division not extending half-way down from the 

 apex nor half-way to the midrib from the lateral margin. 



Mangrove. — A plant inhabiting a tropical sea-swamp and 

 possessing air-breathing roots. 



Mechanistic. — Relating to machine-like activity in organiza- 

 tion and function, without regard to purpose and utility. 



Median. — (1) Relating to the main axis (in proliferation) ; 

 (2) fore and aft (position of leaf-pair of axillary shoot). 



Medullary. — Belonging to the pith. 



Meiomero us. —Having a small number of parts or organs. 

 Meristem. — Undifferentiated tissue from which the various 



kinds of tissue arise. 

 Metamorphosis. — Transformation. 



Monarch. — Having a single protoxylem-group in the stele. 

 Monoecious. — Bearing the two kinds of sexual organs in 



distinct flowers on the same plant. 

 Monopodial. — A type of branching in which the branches are 



subsidiary to, and therefore in a lateral position on, the 



main axis. 



Morchelloid. — Resembling Morchella (morel) in the type of 

 hymenium. 



