Classification of Plants 



22 1 



scope, and are conseijuentl)' so unfamiliar to those lor whom 

 this book is intended that they can be but briefly mentioned. 



Division I. — Th 



AI,LOPH\'TA. 



This division includes a great variety of plants, some very 

 simple and others quite elaborate, but they are grouped together 





0.-0-: 



wmmmm 



P„o9S.9'9 



o;^|l^:^5lg^o;cf^5^^. 



Fig. 195. — V^aucheria. A, B, formation of nntheridia and oogonia ; /?, male 

 branch ; .;, antheridium ; os:, oogonium ; C, oogonium opening to exude the 

 drop of mucilage, f/ : D, spermatozoids : E, spermatozoids entering oogonium : 

 F, (/, an empty antheridium ; osp, oogonium with oospore or fertilized oo.-pherc 

 (magnified), (.\fter Goebel and Pringshein.) 



as having no root, stem or leaves, and in having one-celled fruiting 

 organs. It may be divided into three subdivisions. 



A. Alg.b. — Most of the plants composing the green floating 

 scum on ponds, which is sometimes called " frog spittle," are alg?e. 

 Others are found on damp walls, on stones, or moist earth. All 

 the seaweeds are algte. These plants may be but single cells, 

 long threads or filaments of cells, or masses of cells. The fila- 

 ments may break apart, and so form new plants, or the cell 



