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EXPLANATION OF PLATES, 



(Plate fig. 



I. 1. Groatsbeard with its cluster-cups {uEcidium Triig< 

 pogotds). 



2. Fragment of same, slightly magnified. 



3. Section of cluster-cup, further magnified. 



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

 dium leucospermum) . 



5. Portion of same, slightly magnified. 



6. Anemone cluster-cups, further magnified. 



7. Leaf of Berberry with cluster-cups {^cidium Ber- 

 heridis). 



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 

 {jEcidimn Urtica). 



11. Nettle cluster-cups, magnified. 



II. 12. Leaf of Pilewort with groups of cluster-cups (JScidium 

 Ranunculacearuni) . 



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

 lens. 



14. Section of Pilewort cluster-cups, magnified. 



15. Bedstraw cluster-cups (J^cidium 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 {Roestelia cornuta). 



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



20. Pear-leaf with its cluster-cups {Rcestelia cancellata). 



21. Cluster-cup from the same, magnified. 



22. Leaves and fruit of Hawthorn with lacerated cluster- 

 cups {Rosstelia lacerata). 



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

 X 250. 

 24. Single cell, more highly magnified, Avith its i)arallel 

 striae. 



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