836 THE AMERICAN NATURALIST. |. [Vor. XXXIX. 
prominent and numerous, t cell wide; distant upwards of 6 rows of wood 
cells. 
Radial.— Rays resinous. Cells a); the upper and lower and termina 
walls thick, strongly but finely pitted. Cells (2), the upper and lower and 
terminal walls thick, finely but strongly pitted ; marginal and interspersed, 
often predominant; the pits on the lateral walls variable and hexagonal, and 
forming a coarse sieve-plate structure which often passes through transi- 
tional forms into a scalariform structure. 
Tangential— Medullary rays resinous, numerous, low to high. Cells (1) 
variable, oblong to broadly oval, and conspicuously unequal. Cells (2) 
chiefly uniform and narrow, but very unequal and often several times higher 
than long, terminal, and pad; often ———À 
LITERATURE. 
BENTHAM, G., AND Hooker, J. D. 
'62-83. Genera Plantarum. London: 3 vols. 
BERRY, E. W. 
:02a. Notes on the Phylogeny of Liriodendron. Bot. Gaz., vol. 34, pp- 
63. 
44- 
BERRY, E. W. 
:02b. Notes on Sassafras. 
Bot. Gaz., vol. 34, pp. 426-450, pl. 18. 
BERRY, E. W. 
:01-:03. Notes on Liriodendron Leaves. Torreya, vol. 1, pp. 105-107 ; 
vol. 2, pp. 33-37; vol. 3, pp. 129-132. 
BERRY, E. W. 
:04a. Additions to the Flora of the Matawan Formation. Bull. Torrey 
Bot. Club, vol. 31, pp. 67-82, pls. 1-5. 
BERRY, E. W. 
:04b. The Cretaceous Exposure near Cliffwood, N. J. Amer. Geol., 
vol. 34, pp. 254-260, pl. 1 
DE Bary, A 
'84. Comparative Anatomy of the Vegetative Organs of the Phaner- 
ogams and Ferns. Oxford: xvi + 659 pp. 
Goopwin, W. L. 
'88. Ringed Trees. Can. Rec. Sci., vol. 3». Pp. 227-229. 
GRAY, A, 
'89. Scientific Papers of Asa Gray, 
selected by Charles Sprague Sar- 
gent. Boston and New York: 
2 vols., viii + 397, iv + 503 pp- 
