PLATE 40.— Pollen, etc. 



Figure 



1. a and b, spiral tissue of lining of anther from wallflower (Cheiranthus cheiri). 



2. Ditto, from London Pride (Saxifraga umbrosa). 



3. Ditto, from Lupinus nanus. 



4. Ditto, from a cactus ( Cereus speciosus). a, side view ; 6, from above. 



5. Ditto, from daisy (Bellis perennis). 



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



7. Pollen of Apocynum venetum. 



8. Pollen of daisy (Bellis perennis). 



9. Pollen of Mesembryanthemum. 



10. Pollen of Alisma plantago. 



11. Pollen of Lupinus nanus. 



12. Pollen of garden-geranium {Pelargonium speciosum). a, front view ; b, side 



view. 



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



the lid of a pore opening. 



14. Pollen of Epilobium montanum. 



15. Pollen of Periploca grceca. 



16. Pollen of Pinus sylvestris. 



17. Pollen of Erica multijlora. 



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



19. Pollen of Basella alba. 



20. Pollen of Passijlora aquilegiaafolia. a, side view ; b, end view ; c, ditto in water. 



21. Pollen of Impatiens noli- me-tang ere. 



22. Pollen of Cucurbita pepo, in water. 



23. Pollen of Ruellia formosa. 



24. Pollen of Thunbergia alata, a ; of Mimulus moschatus, the musk-plant, b. 



25. Compound pollen of Acacia laxa. 



26. Pollen of Hibiscus trionum. 



27. Pollen of chicory (Cichorium Tntybus). 



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



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



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



31. Spermatozoid from the globule of Chara fragilis. 



32. Spermatozoids from the antheridium of Marchantia polymorphs. 



33. Spermatozoids from the antheridium of Polytrichum commune. 



34. Spermatozoids from the antheridium of a Fern (Gymnogramma). 



35. Spiral-fibrous cells of the sporange of Marchantia polymorpha. 



36. Elater of Marchantia polymorpha. 



37. Fragments of ditto, a, from the middle ; 6, one end. 



38. Elater of Frullania dilatata. 



39. Elaters (a) and spores (6) of Trichia. 



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





