straight to S-shaped poretubes

knowledge base : exist
structure : inner wall
Stipules : isn't included in the term
Carcass perforations: inner wall (IW) : Pores
Type of carcass pores (IW) : isn't included in the term
Relationship between rows of carcass pores and intersept (IW) : isn't included in the term
Relationship between rows of carcass pores and tabulae (IW) : isn't included in the term
Building of carcass perforations (IW) : isn't included in the term
Carcass external plates: inner carcass wall (IW) : Present
Type of carcass external plates (IW) : Poretubes
Shape of carcass external plates (IW) : Planar ; Arcuate ; S-shaped
Direction of carcass external plates (IW) : isn't included in the term
Type of morphological tubes (IW) : isn't included in the term
Additional sheath : isn't included in the term