Stipule: Leaflike appendage arising from canal-bract junction in a wall of inverted-V or V-shaped appearance.
Canal: Pore modified by skeletal structure thikening or by lintels streching. Canal length is greater than perforation diameter.
Bract: Plate stems from lintels which incompletely covering a single pore.
Lintel: Skeletal structure separating and bounding adjacent pores.
Carcass: Part of wall on intervallum side.
Outer wall: External part of the skeleton, composed by a porous carcass, simple or coated by an additional sheath.
Carcass: Part of wall on intervallum side.
Inner wall: Internal part of the skeleton, separating central cavity and skeleton structure, composed by a porous carcass, simple or coated by an additional sheath.
No stipule.