184 Proceedings of the Ohio State Academy of Science 



Megaspore. The larger of the two kinds of nonsexual spores produced 

 in the flower. The megaspore develops into the female 

 gametophyte. 



Megasporangiimi. A sporangium which produces megaspores ; the ovule 

 in seed plants. 



Membranous. Thin and rather soft and pliable. 



Mesophyte. A land plant adapted to ordinary conditions of moisture. 



Microspore. The smaller of the two kinds of nonsexual spores produced 

 in the flower. The microspore develops into the male game- 

 tophyte. 



Microsporangium. A sporangium which produces the microspores ; the 

 incipient pollen sacs in the seed plants. 



Midrib. The central rib of a leaf or other organ. 



Monadelphous. Stamens with united filaments. 



Monoecious. Having staminate and carpellate flowers on the same plant. 



Monosporangiate. Flowers bearing only one kind of spores ; a flower 

 with only stamens or carpels. 



Mucronate. With a sharp abrupt point. 



Mucronulate. Slightly mucronate. 



Naturalized. Plants not indigenous to a region hut liaving become estab- 

 lished as part of the flora. 



Natural pruning. The process l)y wliich dead twigs and branches are 

 separated from the tree by the formation of a collar or callus. 



Nectary. A nectar-secreting organ. 



Node. The place where two internodes join, normally with a single 

 leaf or more. 



Nut. An indehiscent one-seeded fruit witli a liard or Ijony pericarp. 



Nutlet. A very small nut. 



Obcordate. Inversely heart-shaped. 

 Oblanceolate. Inversely lanceolate. 

 Oblong. Somewhat longer than broad with the sides nearly or quite 



parallel. 

 Oosphere. The unfertilized egg; the female gamete. 

 Oospore. The fertilized egg. 



Ovary. The female organ of reproduction ; an egg-producing organ. 

 Ovate. Shaped like the longitudinal section of a hen's egg. 

 Ovulary. The ovule-bearing part of a closed carpel or set of carpels. 

 Ovule. The megasporangium of a seed plant which later develops into 



a seed. 

 Ovum. The egg or oosphere. 

 Palmate. Diverging like the fingers of a hand. 

 Panicle. A compound inflorescence of the racemose type usually of pyra- • 



midal form. 



