GLOSSARY 157 



Lenticels. The wart-like prominences on the bark of young 

 twigs; very conspicuous on elder etc.; forming long cross- 

 lines on young branches of cherry and paper birch. 



Lignified. Woody. 



Linear. Narrow and elongated, with nearly parallel sides. 



Lobed. Divided rather deeply, as applied to leaves the seg- 

 ments too long to be called teeth but not separated as 

 leaflets. 



Mamillated. With rounded breast-like elevations. 



Matted. Growing densely, so as to form a low close cover to 



the ground, or in very compact tufts. 



Medullary rays. The plates radiating from pith to bark in ex- 

 ogenous stems: appearing as lines, sometimes heavy 



(oak), in cross section. 



Megalospores. The large or female spores of some fernworts. 

 Membranaceous. Thin and dry, in contrast with green and 



leaf-like, as applied to scales or bracts, 

 -merous. Parted. A suffix used to indicate the number of 



sepals, petals etc. in the flower; as trimerous (3-merous), 



tetramerous (4-merous), pentamerous (5-merous). 

 Microspores. The small or male spores of some fernworts. 

 Midrib. The strong main vein running from the base to apex 



in a pinnately veined leaf, like that of chestnut or apple. 

 Milky. Colored, usually white, when applied to the sap of 



trees. 

 Monadelphous. Stamens united by their lower part into a ring 



or tube, as in hollyhock. 



Monocotyledons. Angiosperms with a single seed-leaf (smilax). 

 Monoecious. Imperfect flowers, the sexes on one individual 



(oak). 

 Monopodial. Continuing the growth from a terminal bud, as 



applied to twigs: in contrast with sympodial. 

 Moss-like. Used loosely to indicate a compact or matted habit 



of growth associated with small overlapping leaves. 

 Mucilaginous. Exemplified by the bark of slippery elm, the 



leaves of sassafras, etc., when chewed. 

 Mucronate. With a short stiff abrupt point. 



