PLATE 32.— Pollen, etc. 



Figure 



1. a and 5, spiral tissue of lining of anther from wallflower (Cheiranthus Cheiri). 



2. Ditto, from London Pride {Saxifrayu umbrosa). 



3. Ditto, from Lupinus nanus. 



4. Ditto, from a cactus (Cereiis speciosus). a, side view; b, from above. 



5. Ditto, from daisy (Bellis peretinis). 



6. Pollen of Viola odorata. a, side view ; 5, end view ; c, in water. 



7. Pollen of Apocynum Venetum. 



8. Pollen of daisy {Bellis per ennis). 



9. Pollen of Mesembryanthemwn. 



10. Vd\[Qn oi Alisma plantayo. 



1 1 . Pollen of Lupinus nanus. 



12. Pollen of garden geranium {Pelaryonium speciosum). a, front view ; 5, side 



view. 



13. Pollen of passion-flower (Passijlora ccerulea). a, perfect grain ; b, grain with 



the lid of a pore opening. 



14. Pollen of Ejnlobium montanum. 



15. VoWen of Periploca y?'ceca. 



16. VoWen of Scorzonera hisj)anica. 



1 7. Pollen of Erica multijlora. 



18. Pollen of Sherardia arvensis. a, side view ; b, end view ; c, ditto in water. 



19. Pollen of BaselJa alba. 



20. Pollen of Passijlora aquileyicefolia. a, side view ; b, end view ; e, ditto in water. 



21. Pollen of Imp aliens noli me- 1 any ere. 



22. Pollen of Cucurbita Pepo, in water. 



23. VoWen of RuelHa/ormosa. 



24. Pollen of musk-plant (Mitnulus moschatus). 



25. Compound pollen of Acacia laxa. 



26. Pollen of Hibiscus Trionum. 



27. Pollen of chicory {Cichorium Intybus). 



28. Pollen of Sonchus palustris, side and end views. 



29. Pollen of Statice linifolia, end and side view. 



30. Pollen-grain with tube upon the stigmatic papillae, from Lathrcea squamaria. 



31. Spermatozoid from the globule of Chara frayilis. 



32. Spermatozoids from the antheridium of Marchantia polymorphu . 



33. Spermatozoids from the antheridium of Poly trichum commune. 



34. Spermatozoids from the antheridium of a Fern (Gymnoyramma^. 



35. Spiral fibrous cells of the sporange of Marchantia poly morpha. 



36. Elater of Marchantia poly morpha. 



37. Fragments of ditto. «, from the middle; 5, one end. 



38. Elater of Frullania dilatata. 



39. Elaters («) and spores {b) of Trichia. 



40. Fragment of the same elater showing the three internal spiral fibres. 



