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