94 PRACTICAL BOTANY 



To this type belong most of the Dicotyledons. The work 

 may be equally well done on Linum usitatissimum or Poly- 

 gonum Fagopyrum. 



Type II. Prepare median longitudinal sections of the apex 

 of the radicle of Phaseolus multiflorus (the Scarlet-Runner), or 

 perhaps better, from the Broad-Bean : in either case the dry 

 seed may be used : treat as the above. Examine with a low 

 power and make out 



1. Calyptra (root-cap). 



2. Piliferous layer. 



3. Periblem. 



4. Plerome, forming the procambium and pith. 



But here all the different tissue-systems will be found to 

 originate from a general meristem, the original formative tissue 

 of none of them being distinct from that of the others. This 

 type may be expressed, shortly, thus : 

 rCalyptrogen v 



I Dermatogen ,A11 united in a general, undifferentiated mass of 

 | Periblem r meristem. 

 [Plerome ) 



As alternative plants of the same type, may be named 

 Cucurbita and Pisum. 



