286 CONIFEROUS TREES 



others dwarfs. Both Abies nordmanniana and 

 A. grandis vary greatly under cultivation, and 

 some specimens of the former that have been 

 brought under my notice are hardly distinguish- 

 able from the Common Silver Fir {A, pectinata). 

 Then the bifid foliage of certain stages of 

 growth of A . firma has caused much uncertainty 

 and considerable differences of opinion as to 

 the specific rank of this and other nearly allied 

 species. 



A. bracteata, A. nobilis, A. amabilis, A. cepha- 

 lonica, Pseudotsuga Douglasii, Sequoia sempervirens, 

 Pinus densiflora, Tsuga Albertiana, Cupressus 

 goveniana, C. lusitanica, and various species of 

 Torreya and Cephalotaxus all wear a remarkable 

 tint of green when growing in Ireland, and which 

 I attribute solely to the humid atmosphere com- 

 bined with suitable soil. 



The wide and marked differences that exist 

 between the juvenile and adult foliage of certain 

 forms of Juniperus, Ctipressus (including Retini- 

 spora and Chamcecyparis), and Thuya, have in 

 many instances led to increased, confused, and 

 erroneous nomenclature. Fortunately, of late 

 years, many doubtful points have been satis- 

 factorily cleared up, and we are now enabled to 

 refer correctly certain previously acknowledged 

 genera to their proper rank of species, and species 

 to that of variety. Notable examples of this kind 

 include Cryptomeria japonica elegans, in which only 

 the primordial leaves are produced ; the so-called 

 Retinispora ericoides and Biota meldensis, which 

 are only undeveloped forms of the Chinese arbor- 

 vitse {Thuya orientalis), in which the scale-like 



