The paper describes the fibre length and ray height of the five tree species,
namely Calophyllum polyanthum Wall., Garcinia cowa Roxb., G. xanthochymus
Hook., Kayeafloribimda Wall, and Mesuaferrea Linn, of the family Guttiferae. In
G. cozva and G. xanthochymusthe fibre length and ray height are higher and longer
than those of the other species. These two microscopic features work as good
characters in delimitating the species of Guttiferae. There is a progressive trend
of increase of fibre length and ray height from near pith to sapwood for all the
species