THE ANATOMICAL STRUCTURE OF THE LEAF. 97 



Garden, Edinburgh, presented by Mr Fowler, and grown at Castle 

 Kennedy. 



Specimens from Kew Herbarium have also been examined. 

 One from the summit of the Hoosack Mountains, Massachusetts ; 

 another from Canada, and a third from Newfoundland, named 

 Pinus Americanus ; but I am rather doubtful of the two last, as 

 some leaves of Fraseri and balsamea approach each other exceed- 

 ingly closely anatomically, and are not readily separated when 

 dried specimens only are consulted. 



No. 3 (91). Pinus {Abies) religiosa, Humbl., Parlatore. 

 Abies religiosa, Schlecht, Lindl. 



Leaves long, sharp at the points ; stomata on the under side of 

 the leaf only. Hypoderma, forming a continuous, or only slightly 

 interrupted, layer under the epidermis of the upper surface. 

 Resin canals close to the epidermis of the lower side of the leaf. 



Most closely related anatomically to A. bracteata, but distin- 

 guished by the form and arrangement of the leaves, by the very 

 resinous, yellow bud-scales, and also by the cones. 



Living specimens have been examined from Glasnevin Garden, 

 Dublin, where it is kept with difficulty ; and from Castle Kennedy. 

 I have also examined leaves from a cone-bearing shoot from Castle 

 Kennedy (1867), now in the Museum, Royal Botanic Garden, 

 Edinburgh. 



An authentic specimen of Abies hirtella was examined from 

 Kew Herbarium. It differs in having the leaves blunt and emar- 

 ginate, and having only a few large, scattered hypoderm cells. 

 As some of the leaves from the rather unhealthy plant in Glas- 

 nevin Garden exhibited a similar character, I am not disposed to 

 consider hirtella a distinct species. 



(92.) Pinus (Abies) Abies, Duroi, Parlatore. 



As Parlatore unites Abies pectinata, De C. ; Abies Nordman- 

 niana, Spach. ; Abies Cephalonica, Loudon ; Abies Apollinis, Link ; 

 and Abies Regince-Amalice, Heldr., and makes them either syn- 

 onyms or varieties, I must depart from his arrangement. 



No. 4. Abies pectinata, De Candolle. 



Leaves rounded or emarginate at the apex. Stomata on the 

 under side of the leaf only. Hypoderma forming a very slightly 



