GLOSSARY OF BOTANICAL TERMS. 



417 



Lyrate. — Applied to a pinnatifid leaf, the 

 . terminal lobe of which is more prominent 

 than the rest. 



Lvsigenous. — A term descriptive of inter- 

 cellular spaces when they are produced by 

 the destruction of cells. 



VfACROSPORES.— The larger of the two 

 kinds of spores produced by the Selagi- 

 nellas and others of the higher Pterido- 

 phyta. 



Macrosporangium. — A sporangium which 

 contains macrospores. 



Maculate. — Blotched or spotted. 



Mamillate. — Bearing teat-like protuber- 

 ances. 



Mammiform. — Teat-like in form; shaped 

 like a cone whose apex is rounded. 



Marescent. — Withering without falling 

 off. 



Mar.morated. — Traversed by veins, as in 

 some kinds of marble. 



Medulla. — The pith. 



Medullary Rays. — Rays of fundamental 

 tissue which connect the pith with the cor- 

 tex, and separate the fibro-vascular bun- 

 dles, in the stems of Dicotyledons and 

 Gymnosperms. 



Medullary Sheath. — A sheath composed 

 of spiral ducts and wood cells surrounding 

 the pith, in Dicotyledons and Gymno- 

 sperms. 



Meiostemenous. — Having the stamens 

 fewer in number than the petals. 



Membranous. — Applied to an organ or 

 part that is flattened, thin and flexible. 



Mericarp. — A portion of a fruit separating 

 from the rest, as the two parts of the cre- 

 mocarp in the Umbelliferae. 



Meristem. — Forming tissue; cells in a 

 state of active division and growth, as 

 those of the cambium layer, etc. 



Mesocarp. — The middle layer of the peri- 

 carp. 



Mesophlceu.m. — The middle layer of the 

 bark. 



Mesophyll. — The interior parenchyma of 

 the leaf. 



Mestom. — That part of a fibro-vascular 

 bundle whose function is mainly conduct- 

 ing ; for example, the ducts. 



Metabolism. — The oxydizing processes 

 that go on in the living plant. 



Metaplasm. — A term sometimes used to 

 designate the granular matter in proto- 

 plasm. 



Metastasis. — Used in botany in the same 

 sense as metabolism. 



Micell.«. — The crystalline particles, which,, 

 according to Naegeli's theory, form th< 

 solid constituents of organic matters. 



Micropyle. — The orifice in the coats of the 

 ovule through which the pollen-tube pene- 

 trates. Also applied to the correspond- 

 ing part in the seed. (Same as foramen). 



Microsomes. — The very minute granular 

 particles seen in protoplasm. 



Microsporangium. — A sporangium which 

 contains microspores. 



Microspore. — The smaller of the two kinds 

 of spores produced by the heterosporous 

 Pteridophytes. 



Midrib. — The main or middle rib of a pin- 

 nately-veined or pinnately-nerved leaf. 



Mitriform. — Shaped like a mitre. 



Monadelphous. — In one brotherhood. Ap- 

 plied to stamens which are united by their 

 filaments into one set. 



Monanthous. — One flowered. 



Moniliform. — Resembling a string of 

 beads. Applied to the shapes of certain 

 hairs, roots, tubers, etc. 



Monocarpic, or Monocarpous. — Fruiting 

 but once. 



Monochasium. — A cyme which has one main 

 axis. 



Monochlamydeous. — Having but one set 

 of floral envelopes. 



Monocotylkdonous. — Possessing but one 

 cotyledon or seed-leaf. 



Monoclinous. — Having both stamens and 

 pistils or both sets of sexual organs. Used 

 in the same sense as hermaphrodite. 



Moncecious. — Belonging to one household. 

 Applied to plants which have separate 

 staminate and pistillate flowers, but both 

 borne on the same plant. 



Monolocular. — Having but one cell or 

 loculus. 



Monomerous. — Applied to flowers that are 

 constructed on the numerical plan of one. 



Monopetalous. — Sometimes used in the 

 same sense as gamopetalous ; literally 

 and strictly, possessing but one petal. 



Monopodial. — Applied to that form of 

 branching in which all the branches origi- 

 nate as lateral appendages. 



Monopodium. — An axis that sends off lat- 

 eral branches in acropetal succession. 



Monosepalous. — Literally, one-sepalled ; 

 but often used in the same sense as 

 gamosepalous. 



