SEED. 



103 



of a dicotyledon, a the plumiila, h tlic r.idlclo, c c tlio cotyledons, 



e the caulicidiis or neck. Lindley jrives tlic foilowinjr account 



of the permination of the monocotyledonous seed. In gcr;ni- 



nation the upper end swells and remains within the testa, the 



1:12 







fi 



lower lengthens and opens at the point, and emits one or more 

 radicles ; and a thread like green hody is protruded tVorn the 

 upper prirt of the portion whicli is len^^thened hcyond the tes- 

 ta. Here the portion remaining within the testa is a :;ingle 

 cotyledon, fig. 143, h, the body which lengthens producing 

 radicles from within its point is the cauliculus and the thread 

 like protruded green j)art is the plum:i!;i, fig. 143, c. 



120. This mode of germination it will be readily observed 

 is very different, from what takes place in dicotyledons. In 

 these the radicle appears directly from the surface, and the 

 cotyledons are outwardly developed, while in the monocoty- 

 ledons the radicles are "emitted from within the substance of 

 the radicular extremity," and the cotvledon remains within 

 the testa. The radicle of the monocotyledon, is enclosed 

 within a sheath which it perforates in its elongation, and 

 issues from between its lips as seen in fig. 143, c. d being the 

 radicle. This sheath Mirb d called a cjleorhiza, and Hi' hard 

 proposed to substitute Kndorhizac^ for monocotyledons and 

 ExorhizaCt for dicotyledons, thus founding the distinction of 



