Pollen of Exallosperma and Helictosperma. A–D, M Exallosperma longiflora E–H, N Helictosperma malacophylla I–L H. poissoniana. A, E, I polar view B, F, J equatorial view C, G, K mesocolpium D, H, L ectoaperture M, N pollen grain wall. A, M Nusbaumer & Ranirison 1992 B–D De Block et al. 1132 E–H, N Phillipson 3068 I–L Leandri 573.