154 GLOSSARY 



Oblong. From two to four times as long as it is broad, and 

 with sides nearly parallel. 



Obtuse. Blunt or rounded at the end. 



Ovate. Egg-shaped. 



Palmate. Having lobes radiating like the fingers of the hand. 



Panicle. An irregularly branching duster of stems bearing 

 fruit. 



Peduncle. That part of the stem on which the fruit is sup- 

 ported. 



Persistent. Remaining for a long time. 



Petiole. The footstalk of a leaf. 



Pinna (Plural, Pinnae). One of the divisions extending to the 

 midvein of a pinnate frond. 



Pinnate. Having the frond cut into lobes extending fully to 

 the midvein or rachis. 



Plnnatifld. Having the frond cut into lobes extending half- 

 way or more to the midvein. 



Pinnule. A secondary pinna ; in a bipinnate frond, the 

 smaller divisions extending to the secondary midvein. 



Kachis (Plural, Rachides). The stem of a fern beginning with 

 the leafy portion. 



Reflexed. Curved backward and downward. 



Revolute. The margins rolled backward or outward. 



Scape. A naked stem. 



Segment. One of the divisions of a bipinnatifid frond. 



Serrate. Having the margin sharply cut into teeth pointing 

 forward. 



Serrulate. Similar to serrate, only with finer teeth. 



Sessile. Connected to the stem without footstalk. 



Sinus. A cleft or rounded_ curve between two lobes. 



Spike. The tip of a peduncle bearing a close or sessile cluster 

 of fruit. 



Sporangium (Plural, Sporangia). The case inclosing the 

 spores. 



Spore. The fruit of cryptogams, corresponding to a seed. 



Stipe. The stem of a fern from the ground up to the leafy 

 portion. 



