194 Fernald—American and Old World Birches. 
Puate VI, figs. 25 to 32, B. MICROPHYLLA. 
FIGURE 25. Fo vin f young shoot of B. microphylla from the Altai Mts., 
rete herb. St. Eatenk berg). 
FIGuRE 26. <Leat f B. fruticosa, var. cuneifolia, Regel (syn. B. microphylla, 
cane’ from the Altai Mts., Siberia—after Regel, Mon. Bet. (1861) 
t. 
Ficure 27.—Lea f of fruiting branch of B. occidentalis, eee (B. fontinalis, 
argent) from ae " Springs, me arigpa o (Engelma wn). 
Figure 28.—Small leaf fro ruiting branch of B. occ Sched tale, Nutt. (B. 
fontinalis, Sargent) pane Coulee City, Washington (Lake and 
Hull, No 4 
FIGURE 29. —Leat of young shoot of B. occidentalis, Nutt. (B. fontinalis, 
Sargent) from the Black Hills, South Dakota (Rydberg, No. 1006). 
Ficure 30.—Le -_ aon dee iting branch of original material of B. alba, a 
soong 8B microphylla, Regel, from the Tyan Shan Mts 
C bateal Asia (Semen 
Figures 31, 32.—Leaves of fruiting branch of B. occidentalis, Nutt. (B. 
fontinalis, Bexaanl) from Laramie Peak, Wyoming (A. Nelson, 
No. 1647). 
PLATE ‘VL figs. 33 to 38, B. pumina. 
Ficure 33. thos: Pam sterile shoot of B. pumila from Anticosti, Quebec 
Ficure 34. papers of Ripe aed shoot of B. alpestris, Fries, from Lapland 
Ficure 35.—Tip of ren sash from Bonne Espérance, Quebec (Allen, No. 70). 
Figure 36. Presat of glabrate form from Bay of Islands, Newfoundland 
horne). 
FIGURE 37. —Leate of — alpestris, Fries, from Norway—after Lange, Fl. 
, Suppl. t. 37. 
Ficure 38. Stas ves of young branch of B. alpestris, Fries, from Lapland 
(Andersson, No. 186). 
Piate VI, figs. 39, 40, B. GLANDULOSA. 
Figure 39.—Leaf of branch from Mt. Washington, New Hampshire (J. A. 
FIGURE 40.—Leaves of branch from Hopedale, Labrador (Sornborger, No. 
80). 
Piate VI, figs. 41 to 44, B. GLANDULOSA, var, ROTUNDIFOLIA. 
Ficure 41.—Leaf from Mt. Washington, New Hampshire. 
Figures 42, 43,—Leaves from Nunivak Island, Behring Sea (J. M. Macoun). 
Ficure 44.—Leaf seri ais Altai Mts., Siberia (ex. herb. St. Pete rsb.). 
Puate VI, figs. 45, 46, B. nana. 
Ficure 45,—Fruiting branch from Grenjadastad, orange (Elizabeth Taylor). 
Figure 46.—Scale from same, enlarged three tim: 
Puate VI, figs. 47, 48, B. wana, var. MIcHAUXII. 
Figure 47.—Fruiting branch from Grand Lake, Newfoundland (Waghorne). 
Ficure 48.—Seale from same, enlarged three tim 
