Descripteur : Type of additional sheath (IW)

Type du descripteur : categorical

Additional sheath: Second part of a wall composed by two zones (carcass + sheath).

IW: Inner wall.

Microporous sheath

Microporous sheath: Thin skeletal plate supported by carcass and pierced by micropores (lesser diameter than pores).

Screen of planar rings

Screen of planar rings: Successive horizontal annular shelves.

None

Hiérarchie

Type of additional sheath (IW)
    |
    |_ Type of microporous sheath (IW) {Screen of planar rings , None}
    |
    |_ Repartition of bracts on additional sheath (IW) {Screen of planar rings , None}

Fait partie des groupes