210 Proceedings of the Royal Irish Academy. 



tsuga, CaiT. Pinus BougJasii belongs to Carriere's Pseudotsuga, and 

 Fi7ms Fortunei to his Keteleeria. Both P. Doiighsii and P. Fortunei 

 must be placed in Carriere's Pseudotsuga. 



The section Tsuga is "^ell characterised by the presence of a single 

 median resin canal, ^rhich is placed below the single central fibro- 

 yascular bundle f oiToing the niidiib ; by the flattened leaves bif ariously 

 placed ; and lastly, by the presence of -vrell marked cushions supporting 

 the leaves. 



Piye species, as described by Parlatore, belong to the restricted 

 section Tsuga, viz. : — 



106. P. Tsuga Ant. 



107. P. canadensis Linn. 



108. P. llertensiana Bougard. 



109. P. dumosa Don. 



110. B. Pattoniana Pari. 



To tliis I have one to add, viz., P. Hookeriana, the Abies Hooker- 

 iana of A. Murray. 



Bertrand only distinguishes four species by anatomical characters, 

 and gives the following synoptic table of these characters : — 



Stomata on the upper surface of the leaf 

 Margin entire ; no hypodeima, 



1^0 stomata on the upper surface of the leaf 

 Margin of leaf serrulate ; hypoderma, 



Tir • i- ( ^0 hypoderma, 



Margin entu-e, ] „ - -^ ' 



'^ ( Hypoderma, 



P. HoOKEEIAlfA, 



P. CAXADEXSIS. 

 P. BpXIy^0>"IAjS"A. 

 P. SlEBOLDH. 



Bertrand fiu-ther gives the following table of the synonomy and 

 di^iibution of the species : — 



Picea (Tsuga) Hookeriana Carr., JN'orthern California. 



Syn. Abies Pattoni Jefl. A. Hookerii Hort. A. '^^'"illiamsonii 



jSTewbujy. 

 Picea (Tsuga) canadensis Link. (T. Mertensiana does not differ 



anatomically from T. canadensis). Pocky Mountains. 

 Syn. Abies canadensis Mich. Pinus Americana L>u Eoi. P. 



canadensis Linn. 

 Picea (Tsuga) Bmnoniana "Wall. Southern China. 

 Syn. Abies dumosa Loudon. A. cedroides Griff. Micropeuce 



Bruuoniana Spach. P. decidua. "W^all. 

 Picea (Tsuga) Sieboldii Carr. Japan. 

 Syn. Pinus Tsu.ga Ant. 



Prom my examination of the species of the section Tsuga, I find 

 that Hookeriana and Pattoniana are distinct ; but I can refer neither 

 of them to Bertrand's Hookeriana. Probably his Hookeriana is our 



