558 



A TEXTBOOK OF THEORETICAL BOTANY 



/% A ^'\ 









D 





\ 



\ 



E 



7 



/ 



H 



K 



M 



Fig. 



564. — Types of stelar structure. A, Typical protostele. B, Medullated protostele. 

 C, Actinostele. D, Lycopodium type. E, Equisetum type. F, Ectophloic siphonostele. 

 G, Typical amphiphloic solenostele. H, Osmunda type. J, Typical dictyostele. 

 K, Perforated dictyostele. L, Polycyclic solenostele. M, Marattia type. {After Ogiiro.) 







4-,.^^Or; ---^ v*:^- -k* j>-' ,' 





Fig. 565. — Botryopteris cylindrica. Transverse 

 section of stem showing protostele. 



