Cockayne. — Development of Seedlings. 297 



ally met with on the alpine shingle-slips at an altitude of 

 1,200 m. It is also found in the shade of the small patches 

 of Fagus cliffortioides so often met with on the slopes of river- 

 terraces. 



The adult leaves are usually divided into segments very 

 much narrower than those of the seedling. There are, how- 

 ever, certainly two forms of this plant so far as the leaves are 

 concerned, the one with quite filiform leaves and the other 

 with the leaf-segments 12 mm. x 3 mm., or even broader. 

 The form growing under the shade of the beech-trees has 

 usually the leaf-segments broader than the form of the open. 

 As to what the effect of shade is on the narrow- leaved form I 

 cannot yet state. Moreover, the broad- and narrow-leaved 

 forms may be two separate species. The rapid development 

 of the root in thickness is of great benefit to the young 

 plant. Possibly, too, the slow germination of the seeds may 

 have an cecological meaning. 



EXPLANATION OP PLATES X.-XII. 

 Plate X. 



Fig. 1. Seedling leaf of Pittosporum rigidum, closely approaching the 



adult xerophilous leaf form ; x 4. 

 Fig. 2. Early seedling leaf form of Pittosporum rigidum ; x 4. 

 Fig. 3. Leaf of seedling Pittosporum rigidum, resembling fig. 1 above 

 and fig. 2 below ; x 4 



Early seedling leaf of Stellaria roughii ; x 6. 



Cotyledon of Gaya ribifolia. 



Early seedling leaf of Gaya ribifolia. 



Seedling of Gaya ribifolia, with cotyledons and 1st leaf. 



Early seedling leaf of Gaya ribifolia. 



Late r seedling leaf of Gaya ribifolia. 



Leaf from one year-old plant of Gaya ribifolia. 



Seedling plant of Plagianthus betulinus ; early leaves have 

 fallen off. 



Leaf from young plant of Plagianthus betulinus. 



Leaf from semi-shrubby form of Plagianthus betulinus. 



Leaf from young plant of Plagianthus betulinus. 



Leaf from semi-shrubby form of Plagianthus betulinus. 



Plate XI. 



Fig. 16. Seedling of Plagianthus betulinus, Chatham Island var., show- 

 ing cotyledons, hypocotyl, and primary root. 



Fig. 17. Early seedling leaf of Plagianthus betulinus, Chatham It-land 

 var. 



Fig. 18. Leaf from young plant of Plagianthus betulinus, Chatham 

 Inland var. 



Fig. 19. [ Leaves from young plant of Plagianthus betulinus, Chatham 



Fig. 20. j Island var. 



Fig. 21. 1st seedling leaf of Veronica odora ; x 4. 



Fig. 22. 2nd seedling leaf of Veronica, odora; x 4. 



Fig. 23. 3rd seedling leaf of Veronica odora; x 4. 



