CHAP. II. GLANDS. 60 



generally of an oblong or circular figure, and are 

 found on the frond of Ferns. 



4thly. The Globular Gland. The glands included 

 under this division have the appearance of small 

 and minute globules, and are found chiefly on plants 

 with labiate flowers. 



5thly. The Lenticular Gland. The figure of this 

 gland is that of a lens more or less elongated. It is 

 found on the young shoots of many trees, but par- 

 ticularly of the Birch. 



Othly. The Cup-shaped Gland. (P LIU. Fig. 7.) 

 This gland presents a cavity in the form of a cup, 

 and is found on the petioles of the Apricot, Nec- 

 tarine, and Passion-flower. 



In some plants the glands are sessile, as those on 

 the petiole of the Cherry ; in others they are sup- 

 ported on a pedicle,, as in the genus Rosa. (PI. III. 

 Fig. 6.) 



Though the petiole is that part of the leaf on 

 which they are most frequently situated, yet they 

 are by no means confined to it. In the leaf of Sal'w 

 pentandra they are situated between the serratures of 

 the margin ; in the leaf of the Tamarisk they origi- 

 nate in the under surface, and in the leaf of the 

 Sundew they originate in the upper surface. The 

 glands of the Moss-rose and Birch-tree are situated 

 on the stem and branch. 



The fluid secreted by the glands is in some cases 

 resinous and fragrant, as in the glands of the Moss- 



