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234 



DR. M. T. MASTERS ON THE MORPHOLOGY, 







these species the caulicle is thick and fusiform. In the section 



JEutassa 



Fig. 2.— Germination of Araucaria imbricata ; early stage, cotyledons enclosed 



within the seed, plumule commencing to protrude. 







. 





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Fig. 3.— Germinating plant of Araucaria imbricata, in a further stage of deve- 

 lopment, showing hypogeal cotyledons, erect plumule, and primordial leaves 

 similar in form and arrangement to the adult ones. 



are raised upon a well-marked caulicle, as in A. exceha, A. Cookii, 

 A. Cunninghami and A. Ciminghami glauca. Bentham, however, 

 remarks that the number of cotyledons varies in the same species 

 We have here, then, illustrations of the fact that very conspicuous 

 characters, and such, as in the case of the hypo- and epigeal 

 cotyledons, are of great physiological significance, may be of rela- 

 tively little value for classificatory purposes, inasmuch as species 

 of the same genus may present variations in these respects. 

 In those cases where the cotyledons are epigeal and leafy in 



1 ■ % * a *» * _ A m a _ * .. — - . . - - _ 1*1 







charact 



•may be two or more. 



very constant in this respect, it being very rare in such plants 



are 



usually 



Bentha 





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