SECT. I. ORGANOGRAPHY AND GLOSSOIjOOY. 35 



plants of this class are termed " Endogense," from the 

 circumstance of the newly formed materials being always 

 developed towards the innermost part of their stems. A 

 piece of cane is a familiar example for illustrating this 

 structure ; but we have no woody plants in our climate 

 belonging to this class, and very few even which possess 

 herbaceous stems, if we except the hollow culms of the 

 grasses, where the development of the materials towards 

 the centre is not sufficiently rapid to keep pace with the 

 elongation of the stem, and the tissue is in consequence 

 ruptured. 



(36'.) Acotyledones. 



(1.) Structure of the Sporules. 



The class to which we now refer, includes an ex- 

 tensive series of plants, grouped under several orders, 

 which differ considerably in many particulars. The 

 whole agree, however, in the important circumstance of 

 never bearing flowers, like those of the two former 

 classes : hence they are termed " cryptogamic," in con- 

 tradistinction to " phanerogamic/' which is applied to 

 all flowering species. Having no flowers, they produce 

 no true seeds ; but, in lieu of them, are furnished with 

 what certainly bear a considerable resemblance to seed, 

 viz. small minute granular bodies capable of becoming 

 distinct plants. The manner in which these " sporules," 

 as they are termed, are produced, is very various in the 

 different orders of this class, but forms no part of our 

 present inquiry. They are also variously shaped, but 

 generally spherical or spheroidal, and are not separable 

 into distinct parts, with radicle and cotyledon, like the 

 seeds of phanerogamous plants. In germinating, the 

 sporules are developed by an increase 27 

 of cellular tissue, which appears in the 

 form of rounded masses and filament- 

 ous chords (jig. 27-)- Among the 

 higher tribes, roots are afterwards 

 produced ; and a part which is more 

 or less elevated above the soil, is the representative 



