EXPLANATION OF PLATES. 



Plate lie;. 

 I. 1. Goatsbeard with its cluster-cups (jEcidiitm Tragi 



„ 2. Fragment of same, slightly magnified. 



„ 3. Section of cluster-cup, further magnified. 



„ 4. Leaf of Wood Anemone with its cluster-cups (JSin- 



dium leucospermum). 

 „ 5. Portion of same, slightly magnified. 

 „ 6. Anemone cluster-cups, further magnified. 

 „ 7. Leaf of Berberry with cluster-cups {j^cidiim Ber- 



beridis). 

 „ 8. Cluster of cups from the Berberry, as seen with a 



lens. 

 „ 9. Cluster-cups of Berberry, magnified. 

 „ 10. Nettle-stem distorted by growth of cluster-cups 



{^cidium UrticiB). 

 „ 11. Nettle cluster-cups, magnified. 

 II. 12. Leaf of Pflewort with groups of cluster-cups {^cidium 



13. Group of cluster-cups from Pilewort, as seen with a 



lens. 



14. Section of Pilewort cluster-cups, magnified. 



15. Bedstraw cluster-cups {Mcidium Galii) on the Great 



Hedge Bedstraw. 



16. Tip of leaflet with cluster of cups, viewed through a 



lens. 



17. Bedstraw cluster-cup from same, magnified. 



18. Leaflets of Mountain-ash with horn-shaped cluster- 



cups (RcBstelia cornuid). 



19. Group of Mountain-ash cluster-cups, magnified. 



20. Pear-leaf with its eluster-oups {RcBstelia cancellata). 



21. Chister-oup from the same, magnified. 



22. Leaves and fruit of Hawthorn with lacerated cluster- 



cups {Bcestelia laceratd). 



23. Elongated cells forming the walls of the cluster-cups, 



X 250. 



24. Single cell, more highly magnified, with its parallel 



strife. 



