

















270 



DU. M. T. MASTERS ON THE MORPHOLOGY, 



























readily 



la Pinus monophylla or Fremontiana 



the same cohesion between two leaves occurs ; but in this plant 

 some of the leaves are, in the adult condition, really solitary, 

 terete, and with a circular peri cycle. 



An examination of the mode of development shows that 

 there are always two foliar tubercles, only one of which is deve- 

 loped, while the other becomes obliterated *. In other cases, 

 as above stated, both leaves are formed, but remain coherent 

 by their edges so as to appear simple. 





















& 



t 



ninghamia sinensis were fascicled like those of Ptnus. A short 

 shoot was developed in the axil of the leaf; the lower leaves of 

 the shoot were scaly and formed a sheath ; the terminal (fascicled) 

 leaves were very narrow and of the same structure as the ordinary 

 leaves, but destitute of resin-canal and also of stomata. 

































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Buds and Branches. 



Arrangement. — The buds of Coniferae do not differ essentially 



■ 



i from those of other plants in position or arrangement. The 

 very marked peculiarity of the ramification depends, as will be 

 presently shown, mainly on the alternate development and non- 



the 



development of the buds. A very common feature in 

 arrangement of the buds is the development of one apical bud 

 at the end of the shoots, whether terminal or lateral, and of a 

 circlet of lateral buds around it at its base. In the erect leader 































QV * 





















































i 



1 



shoots the circlet is complete Q 



o — o 

 o 



it usually happens, as seen in the species of Abies and Picea, 

 that the uppermost buds of the circlet, if developed at all, 



remain in a rudimentary condition, thus • This is evi- 



o 



dently connected with the horizontal position of the branches ; 

 but it is curious to note that the uppermost buds, those most 



Engelmann in Wheeler, Report, vi. p. 259, Botany of California, iL (1880), 

 p. 124 ; Bertrand in Ann. Sc. Nat. torn. xx. (1874), p. 102, tab. ix. figs. 5, 6. 



Hooker in Gard. Chron. (1886), July 31, p. 13G ; Masters in Annals of Be 

 vol. ii. (1888), p. 126 (anatomy and development). 



t Bertrand in Ann. Sc. Nat., Bot. ser. 5, vol. xx. p. 113, t 11. figs. 4, 5 















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