Pollen morphology of 44 species representing 9 genera of Tiliaceae in  China was examined under light microscope,  10 of them were observed with scanning electron microscope.

Nine genera involved in this paper are:  Colona.  Corchoropsis, Corchorus, Excentrodendron, Grewia,  Hainannia,  Microcos,  Tilia and Triumfetta

       The pollen grains  of  Tiliaceae  are  eurypalynous.  Based  on  the  aperture  type  and ornamentation,  they may be grouped into four types: (1)  The Grewia  type, pollen grains tricolporate:  Colona,  Corchorus, Grewia,  Microcos and  Triumfetta,  (2) The Tilia  type, pollen grains brevitricolporate: Hainania and Tilia, (3) The Corchoropsis type,  pollen grains triporate,  spinate: Corchoropsis,  and  (4) The Excentrodendron type, pollen grains triporate, reticulate: Exce ntrodendron.

The significance of pollen morphology in taxonomy of Tiliaceae is discussed.  The palynological data seem to support the separation of Microcos from Grewia and the  transfer  of Corchoropsis to Sterculiaceae from Tiliaceae.