rounded. (7) Crenulate, if the teeth are minutely 

 crenate. (8) Bicrenate, if the crenatures them- 

 selves are crenate. (9) Sinn ite, sinuous, sinuose, 

 if the margin has deep concavities and convexi- 

 ties. (10) Wavy or undulate, if the margin is 

 wavy, (n) Crisped or curled, if the margin is 

 very irregular, being twisted and curled. 



When the margin of the frond or of a part of 

 it is more deeply divided than is the case in the 

 above instances, the surfix ' fid ' is employed to 

 describe it, and the divisions are termed lobes 

 or segments. Hence, according as the frond or 

 part of the frond belongs to the palmate or 

 pinnate type, it is said to be palmatifid or 

 pinnatifid. If the divisions of a pinnatifid frond 

 or part of frond are again incised the terms bi- 

 pinnatifid or two-pinnatifid, tri-pinnatifid or 

 ikrec-pinnatifid, etc. are used. If a frond or 

 part of it is deeply incised and the divisions are 

 narrow and close so as to resemble a comb, the 

 same is said to be pectinate. 



The Apex. The apex of the frond, whether 

 simple or compound, or of the pinnae or pinnules, 

 or of the segments, varies considerably in outline 

 and has received various names. [Plate III.-B.] 

 It is obtuse or blunt, if it is rounded ; retuse, if 

 it is rounded with a rounded depression in the 



