52 GENUS PINUS 



26. PINUS TROPICALIS 



1851 P. TROPICALIS Morelet in Rev. Hort. C6te d'Or, i. 105. 



1904 P. TERTHROCARPA Shaw in Gard. Chron. ser. 3, xxxv. 179, f. 74. 



Spring-shoots uninodal. Leaves binate, sometimes ternate, from 15 to 30 cm. long, rigid, erect; 

 hypoderm of uniform thick- walled cells; resin-ducts of remarkable size, septal, or not quite touching 

 the endoderm and technically external. Scales of the conelet minutely tuberculate. Cones from 5 to 

 8 cm. long, short-pedunculate, erect or patulous; ovate-conic, symmetrical; apophyses rufous 

 brown, low-pyramidal, the umbo mutic. 



Growing at sea-level within the tropics and confined to western Cuba and the Isle of Pines. On 

 the island it is associated with P. caribaea. This species needs no other means of identification 

 than its peculiar leaf-section. Septal ducts are found in P. oocarpa, Pringlei, Merkusii and rarely 

 in other species, but they never attain the extraordinary size that appears to be invariable in 

 P. tropicalis. 



Plate XIX. 



Fig. 172, Cone and enlarged conelet. Fig. 173, Branch with leaves, much reduced. 

 Fig. 174, Leaf-fascicle and magnified leaf-section. Fig. 175, Trees on the Isle of Pines. 



27. PINUS MASSONIANA 



1803 P. Massoniana Lambert, Gen. Pin. i. 17, t. 12. 



1861 P. canaliculata Miquel in Jour. Bot. Neerland. i. 86. 



Spring-shoots uninodal. Leaves binate, rarely ternate, from 12 to 20 cm. long, slender and pliant; 

 hypoderm inconspicuous ; resin-ducts external. Staminate catkins often in long dense clusters. Cone- 

 lets partly tuberculate or mucronate, partly mutic. Cones symmetrical, from 4 to 7 cm. long, ovate- 

 conic, short-pedunculate, early deciduous; apophyses sublustrous, nut-brown, flat or somewhat 

 elevated, the umbo usually mutic. 



The Chinese Red Pine is found in warm-temperate climates. It is native to southeastern China 

 and follows the valley of the Yangtse River into Szech'uan. It has been confused by Loudon with 

 P. pinaster, which it resembles in no respect, by Siebold with P. Thunbergii, from which it differs in 

 leaf-dimensions and in leaf-section, and by Mayr with his P. luchuensis, whose peculiar cortex and 

 whose leaf-section has no counterpart among Chinese Hard Pines. Its nearest relative is P. densi- 

 flora, from which it differs in its longer leaves, in the color of its cone and in its conelet (Plate XX, 

 figs. 176, 179). 



Plate XX. 



Fig. 176, Cone and enlarged conelet. Fig. 177, Two leaf-fascicles. Fig. 178, Magnified 

 leaf-section. 



28. PINUS DENSIFLORA 



1842 P. DENSIFLORA Siebold & Zuccarini, Fl. Jap. ii. 22, t. 112. 

 1854 P. scopiFERA Miquel in Zollinger, Syst. Verz. Ind. Archip. 82. 



Spring-shoots more or less pruinose, uninodal. Leaves binate, from 8 to 12 cm. long, slender; 

 hypoderm of few inconspicuous cells; resin-ducts external. Staminate catkins in long dense clusters. 

 Scales of the conelet conspicuously mucronate. Cones symmetrical, from 3 to 5 cm. long, ovate- 

 conic, often persistent for a few years but with a weak hold on the branch; apophyses dull pale 

 tawny yellow, flat or slightly elevated, the mucro more or less persistent. 



The Japanese Red Pine forms extensive forests on the mountains of central Japan. It is perfectly 

 hardy in cold-temperate climates. Wild specimens of China, ascribed to this species, are forms of the 



