Some cones of this species develop protuberances of all degrees of prominence up to the curious cone collected in Oaxaca by Nelson (var. apulcensis, Shaw, Pines Mex. t. 12, fig. 8). There is also a remarkable difference in the amount of leaf-hypoderm. On many trees of the western part of the range this tissue forms septa across the green mesophyll. Such partitions are sometimes met in other species, P. Pringlei or P. canariensis, where the hypoderm is abundant. But in P. pseudostrobus they appear in some leaves of weak, as well as of strong hypoderm (var. tenuifolia, Shaw, Pines Mex. t. 13, ff. 2, 4, 5, 7, 8). Plate XXIV. Fig. 211, Cone. Fig. 212, Two cones of var. tenuifolia. Figs. 213, 214, Two cones of var. apulcensis. Fig. 215, Magnified section of 3 leaves of var. tenuifolia. Fig. 216, Magnified section of 2 leaves of the species. Fig. 217, Bud destined to produce staminate flowers. Fig. 218, Ten-year old branch showing smooth cortex. Fig. 219, Young and mature trees in open growth. [Illustration: PLATE XXIV. PINUS PSEUDOSTROBUS] 38. PINUS MONTEZUMAE 1817 P. occidentalis H. B. & K. Nov. Gen. ii. 4 (not Swartz). 1832 P. Montezumae Lambert, Gen. Pin. ed. 8vo, i. 39, t. 22. 1839 P. Devoniana Lindley in Bot. Reg. xxv. Misc. 62. 1839 P. Hartwegii Lindley in Bot. Reg. xxv. Misc. 62. 1839 P. Russelliana Lindley in Bot. Reg. xxv. Misc. 63. 1839 P. macrophylla Lindley in Bot. Reg. xxv. Misc. 63. 1840 P. filifolia Lindley in Bot. Reg. xxvi. Misc. 61. 1841 P. Sinclairii Hooker & Arnott, Bot. Beechy Voy. 392, t. 93 (as to cone). 1841 P. radiata Hooker & Arnott, Bot. Beechy Voy. 443 (as to leaves). 1847 P. Grenvilleae Gordon in Jour. Hort. Soc. Lond. ii. 77, f. 1847 P. Gordoniana Hartweg in Jour. Hort. Soc. Lond. ii. 79, f. 1847 P. Wincesteriana Gordon in Jour. Hort. Soc. Lond. ii. 158, f. 1847 P. rudis Endlicher, Syn. Conif. 151. 1847 P. Ehrenbergii Endlicher, Syn. Conif. 151. 1858 P. Lindleyana Gordon, Pinet. 229. 1891 P. Donnell-Smithii Masters in Bot. Gaz. xvi. 199. Spring-shoots uninodal, slightly or not at all pruinose. Bark-formation early, the branches becoming dark and rough. Leaves prevalently in fascicles of 5, but varying from 3 to 8, extremely variable in length, attaining 45 cm. at subtropical levels; resin-ducts medial, hypoderm sometimes uniform, more commonly multiform, the outer walls of the endoderm thick. Conelet mucronate, the prickle often reflexed. Cones of many sizes, attaining in warm localities 30 cm. in length, ovate-conic or long-conic, symmetrical, often curved, deciduous and often leaving a few scales on the tree; apophyses dull, rarely lustrous, nut-brown, or of various shades of fuscous brown to nearly black, flat, tumid, pyramidal or sometimes slightly protuberant, the prickle rarely persistent.