EXPLANATION OF PLATES. 



Plate fiff. 



I. 1. Goatsbeard with its cluster-cups {^cidium Trago 

 pogonis). 



2. Fragment of same, slightly magnified. 



3. Section of cluster-cup, further magnified. 



4. Leaf of Wood Anemone with its cluster-cups {^ci- 

 dium leucospermum) . 



5. Portion of same, slightly magnified. 



6. Anemone cluster-cups, further magnified. 



7. Leaf of Berberry with cluster-cups {JJJcidium 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 

 {j^cidium Urticce). 



11. Nettle cluster-cups, magnified. 



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

 Raminculacearuni) . 



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

 lens. 



14. Section of Pilewort cluster-cups, magnified, f 



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

 Hedge Bedstraw. 



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

 lens. 



17. Bedstraw cluster-cup from same, magnified. 



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

 cups {Roestelia cornuta). 



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



20. Pear-leaf with its cluster-cups {licestelia cancellatd). 



21. Cluster-cup from the same, magnified. 



22. Leaves and fruit of Hawthorn with lacerated cluster- 

 cups (Roestelia laceratd). 



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

 X 250. 



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

 striae. 



35 



JJ 



3J 

 JJ 

 JJ 



JJ 



JJ 

 JJ 



JJ 



JJ 



JJ 

 JJ 



JJ 



JJ 

 JJ 



JJ 

 JJ 

 JJ 

 JJ 



JJ 



JJ 



