^02 Proceedings of the Ohio State Academy of Science. 



Microspore — The smaller of the two kinds of nonsexual spores 



produced by heterosporous plants. 

 Microsporangium — A sporangium which produces microspores. 

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

 Mucronate ^ With a sharp, abrupt point. 



Nectary — A nectar-secreting organ. 



ISIode — The place where two internodes join, normally with 

 one or more leaves. 



"Oblong — Somewhat longer than broad, with the sides nearly 



parallel. 

 'Obovate — Inversely ovate. 



O'osphere — The unfertilized egg ; the female gamete. 

 Oospore — The fertilized &gg. 

 Orbicular — Nearly circular in outline. 

 'Ovary — The female organ of reproduction. 

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



Palmate — Diverging like the fingers of a hand. 



Panicle — An open cluster, consisting of more or less branching 

 stems bearing fruit. 



Peltate — Shield-shaped. 



Perennial — Growing for many years. 



Petiole — The stalk of a leaf. 



Pilose — With long, soft hairs. 



Pinna — The primary division of a pinnately compound leaf. 



Pinnate — Leaves divided into leaflets or segments along a com- 

 mon axis. 



Pinnatifid — Pinnately cleft to the middle and beyond. 



Pinnule — A division of a pinna in a compound leaf. 



ProthalHum — Sometimes applied to the thalloid gametophytes 

 of the Pteridophytes. 



Pubescent — Hairy, especially with fine, soft hairs. 



