410 A HANDBOOK OF CONIFERS 



on poor, dry, sandy soil, for there are numerous fine trees, includ- 

 ing an old one near the Main Gate planted by Salisbury in 1813 

 and now 95 ft. high with a girth of 9 ft. 2 in. at 5 ft. from 

 the ground. In N. Wales the Corsican pine has given good 

 results on Lord Penrhyn's estate and in other places. Both 

 Corsican and Austrian pines should be planted in permanent 

 places when not more than 18 in. high, and if the planting 

 positions are very exposed, young trees 9-12 in. high are usually 

 more suitable than larger ones. The Corsican pine, although 

 not immune from attacks by rabbits, is less seriously injured 

 than Scots pine. It is sometimes injured by pine aphis, and 

 young trees occasionally fall a prey to root fungi, but on the 

 whole the species is singularly free of enemies. Like most other 

 pines, it requires plenty of Hght. For plantation work good 

 results have been obtained by planting the trees 5 ft. apart each 

 way. 



Elwes and Henry, loc. cit. ii, p. 407 (1907) ; Woolsey, French Forests and 

 Forestry (1917). 



Plnus Lawsoni, Roezl. 

 Lawson's Pine. 



Pinus Altamirani, Shaw. 



A tree 80-100 ft. high, with a trunk 6 ft. or more in girth, 

 covered with dark grey scaly bark. Young shoots glaucous. 

 Leaves in threes, fours, or fives, glaucous green, up to about 9 in. 

 long. Resin canals internal, but often with 1 or 2 in a median 

 position. Cones variable in size and in the shape of the scales, 

 ovate-conic, up to about 3 in, long on pliant stalks ; scales with the 

 exposed portion nut-brown, flat or swollen. 



A sub-tropical species found in Cent, and W. Mexico. It 

 sometimes grows with P. MontezumcB and other Mexican species, 

 but is recognized by its conspicuously glaucous foliage. 



This species is not in cultivation. Its timber is apparently 

 used indiscriminately with that of other Mexican pines. 



Shaw, Genus Pinus, p. 68 (1914). 



Pinus leiophylla, Schlechtendal and Chamisso. 

 Smooth-leaved Pine. 



Pinus Ceclrus, Roezl ; P, Comonfortii, Roezl ; P. Decandolleana, Roezl ; 

 P. depenclens, Roezl ; P. Fenzlii, Antoine and Kotschy ; P. gracilis, 

 Roezl ; P. halepensis, Bieberstein (not ^Nluller) ; P, huisquilcaensis, Roezl ; 

 P. Lerdoi, Roezl ; P. Monte-Allegri, Roezl ; P. verrucosa, Roezl. 



A tree of moderate size with slender branchlets, bearing 

 clusters of short shoots on the trunk and branches like P. rigida. 

 Young shoots slender, glaucous. Leaves in fives, persisting 2 years, 

 short, slender, grey-green, 3-4 in. long, marginal teeth scarcely 



