228 The Trees of Great Britain and Ireland 



to the longer and terminal ones. Cones oblong -cylindrical, large, composed of 

 numerous (about seventy) scales. 



This section includes one species : — 



1. Tsum Pattoniana, Sendclauze. Western North America. 



II. Micropeuce, Spach, Hist. ]'<^g. xi. 424 (1842), identical \N\\.\i Eutstiga, Engel- 

 mann, loc. cit. 120(1880). 



Leaves flat, grooved above, bearing stomata on the lower surface only, pectinately 

 arranged on the branchlets, which are all in one plane. Cones ovoid, small, com- 

 posed of few scales, rarely more than twenty-five. 



This section comprises the remaining species, of which six are in cultivation in 

 this country. These may be conveniently arranged as follows : — 



A. Leaves serrulate in margin. Shoots pubescent. 



2. Tsuga Canadensis, Carriere. Eastern North America. 



Leaves, ^ to f inch long, usually tapering from the base to the acute or rounded 

 apex ; lower surface marked with two narrow well-defined white stomatic bands, the 

 part of the leaf external to them being pure green in colour. Buds brown, ovoid, 

 pointed, composed of pubescent, keeled acute scales. 



3. Tsuga Aibertiana, Sen^clauze. Western North America. 



Leaves, \ to f inch long, usually rounded at the apex and uniform in breadth ; 

 lower surface with two ill-defined broad white stomatic bands, which are indistinctly 

 continued to the margins, there being no distinct bands of pure green. Buds greyish, 

 ovoid, apex obtuse and flattened ; scales keeled, pubescent. 



4. Tsuga Brunoniana, Carriere. Himalayas. 



Leaves, i to i| inch long, gradually tapering from the base to the acute apex ; 

 lower surface silvery white, stomatic bands well-defined and extending almost 

 to the margins. Buds globose, flattened on the top, surrounded at the base by a 

 ring of modified leafy scales, the other scales ovate, acute, pubescent. 



B. Leaves entire in margin. Shoots glabrous. 



5. Tsuga Sieboldii, Carriere. Japan. 



Leaves, 1 to i inch long, oblong, rounded and notched at the apex, shining 

 above ; lower surface with two narrow well-denned white stomatic bands. Buds 

 red, ovoid, slightly acute at the apex ; scales glabrous and ciliate. 



C. Leaves entire in margin. Shoots pubescent. 



6. Tsuga diversifolia, Maximowicz. Japan. 



Shoots pubescent, both on the leaf-bases and in the furrows between them, 

 Leaves, i to l inch long, oblong, rounded and notched at the apex ; lower surface 

 with two narrow well-defined white stomatic bands. Buds red, pyriform, flattened 

 above ; scales obtuse, minutely pubescent. 



7. Tsuga Caroliniana, Engelmann. Southern Alleghany Mountains. 



Shoots pubescent in the furrows between the leaf-bases, which are glabrous. 



