Descriptor : Type of additional sheath (IW)
Descriptor type : categorical
Additional sheath: Second part of a wall composed by two zones (carcass + sheath).
IW: Inner wall.
- Microporous sheath
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Microporous sheath: Thin skeletal plate supported by carcass and pierced by micropores (lesser diameter than pores).
- Screen of planar rings
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Screen of planar rings: Successive horizontal annular shelves.
- Sieve formed by protrusions
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Sieve: Aditional sheath stemmed from pores subdivisions.
Subdivided pore: Pores irregularly divided by radial protrusions of lintels.
Protrusion: Rod divided pores.
Lintel: Skeletal structure separating and bounding adjacent pores.
Sieve formed by protrusions
Hierarchy
Additional sheath | |_ Type of additional sheath (IW) | |_ Type of microporous sheath (IW) {Screen of planar rings , Sieve formed by protrusions} | |_ Repartition of bracts on secondary sheath (IW) {Screen of planar rings} | |_ Type of sieve (IW) {Microporous sheath , Screen of planar rings} | |_ Repartition of micropores (IW) {Screen of planar rings}