184 Proceedings of the Ohio State Academy of Science 



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

 m the flower. The megaspore develops into the female 

 gametophyte. 



Megasporangium. 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. 



]y[ucronulate. Slightly mucronate. 



Naturalized. Plants not indigenous to a region but having become estab- 

 lished as part of the flora. 



Natural pruning. The process l)y which 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 with a hard or bony 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. 



