92 Proceedings of the Royal Irish Acmiemy. 



EXPLANATION OF PLATES. 



Plate XII. 



Seed-scale, a\ bract, h; and seed, c; all x \, of ripe cones of — 1, /'. I)oug- 

 lasii ; 2, /*. glauca ; 3, /'. Doiujlasii, var. cacsia ; 4, P. macrocarpa ; 5, P. 

 sinensis ; 6, P. Forrcstii ; 7, /'. japonica. 



Young cones of 8, P. glaiica ; and 9, P. Douglasii. 



a, female flower, x |. 



b, c, d, bracts from centre, base, and apex of Llie cone, x \. 



e, ovular scale, x f . 



Mature cones, x I, reproduced from photographs, of Pseudotsuga Foircstii, 

 P. japonica, and P. sinensis. 



Platk XIII. 



Mature cones, x 1, reproduced from pliotograplis, of Psevdotstiga macrocarpa, 

 P. Douglasii, P. Doiigla-sii, var. cacsia, and P. glauca. 



Plate XIV. 



Transverse sections of the leaves, x 40, of — 1, Pseudotsuga liouglasii; 

 '2, P. glauca; '.i, P. Douglasii, \&v. cacsia] 4, /'. macrocarpa; 5, P. sinensis; 

 6, P. Forrcstii; 7, P. japonica. 



