II. — BOTANY. 



Art. XXVIII. — An Inquiry into the Seedling Forms of New 

 Zealand Phanerogams and their Development. 



By L. Cockayne. 



[Read before the Philosophical Institute of Canterbury, 7th November, 



1900.] 



Plates X.-XII. 



Part IV.* 



No. 360. Pittosporum rigidum, Hook. f. Plate X., figs. 1, 

 2, 3. (Continued from Trans. N.Z. Inst., vol. xxxi., 

 p. 362.) 



In the paper quoted above the seedling form of this species 

 of Pittosporum is described as far as the development of the 

 5th leaf from seedlings which germinated early in the spring 

 of 1898, and which are consequently now — 28th August, 1900 

 — about two years old. Some of the young plants are still 

 growing in the flower-pot in which the seed was sown, and 

 have been kept since their germination in an unheated green- 

 house. Others were transferred into separate pots some six 

 months ago, since which time they have been kept plunged 

 in moist sand in the shade-house, a structure consisting of 

 a wooden frame-work, span-roofed, and covered with white- 

 calico blinds. Within this shade-house the air is usually 

 more moist, the illumination much more feeble, the changes 

 of temperature less extreme, and the wind less felt than 

 in the open — indeed, the cecological conditions cannot be 

 very different from those of certain forests, where the foliage 

 is not extremely dense. The greenhouse as compared with 

 the shade-house is hotter, moister, much more brightly illu- 

 minated, and its atmosphere is quite still. With regard to 

 the plants in question, those of the greenhouse and those of 

 the shade-house exhibit no differences of any moment. Most 

 have produced one or two lateral shoots, which are given 

 off from the stem at about an angle of 45°. The tallest plants 

 are 9 cm. in height. Their stems are covered with numer- 



* For Part III. see Trans. N.Z. Inst., vol. xxxii., art. xvi. 



