CELL TYPE CYTOPLASMIC FEATURES CELL WALL FEATURES 3-D GEOMETRY
Sclereid

Typically no cytoplasm at maturity
 
 

Uniformly thick, lignified secondary cell wall with simple or ramiform  pits

Subcategories based on 3-D Geometry
 
Name Shape
Brachysclereid Isodiametric
Macrosclereid Columnar
Osteosclereid Columnar with enlarged ends
Astrosclereid Stellate
Trichosclereid Elongate and branched
Filiform sclereid Very elongate and unbranched