g 
} 
16 PROF. JULIUS MACLEOD ON TEN 
TABLE IX. 
Mean percentage curves of the breadth of the leaves at their base in ten species 
of Mnium. The absolute values (in mm.) are given in the descriptive 
tables of the species. Hach species is represented by one patch. 
Intervals: 1. 2; 3. 4. 5. 6. ae 8. 9. 10. 
mme a aan 117 4128 — 18D 131: 124 .127 .119 104. 97. .100 
cuspidatum ........ E073 51012774189 188 $5132 25197. Loe. 116. 08: 100) 
onum. iei 59 67 73 81 87 90 92 96: 101. 100 
orthorrhynchum .... T$ 84 92 96 104 | 192 .194 118 105 100 
undulatum ........ NOS 10 028 — 145^ 149^ /185 184^ 199 — 114 100 
NOTA est 65 70 68 73 70 71 77 78 90 100 
BODIORHA Sites 40s) ts DO oona a 122%, 122 :-118 : 108 108-- 100; 100 
punctatum.......... 105 11]. 04 -.118: 114-109. 112.110 4-106. 100 
subglobosum ........ 72 83 94 94 89 95 88 92 98 100 
TEDQUM TTL EN RE 91 97 Bo 108: 108- 014 . 115.110 — 100^ 300 
Type III. : In some curves the increase is rapid in the first intervals ; when 
a certain value is reached it remains constant or almost constant in the next 
intervals, the curve assuming the form of a horizontal line—LZwamples : 
The number of cells at the place of the greatest breadth of the leaves in 
M. undulatum (almost constant in intervals 4-10) and also M. spinosum 
(intervals 4-8). See Table X., in which the curve of a third species is given 
for comparison. 
TABLE X. 
Mean interval curves of the number of cells of the leaves at the place of the 
greatest breadth in three species of Mnium. Absolute values. 
Intervals: 1. 9. 3. 4. 5. 6. T: 8. 9. 10. 
OD Pen] HORS RU ra 63 71 76 91 92 89 91 90 89 89 
PRED ORS AS aS 40 59 84 91 91 90 88 88 87 89 
orthorrhynchum .... 28 82 37 40 46 58 60 60 52 42 
Tyrs IV.: In some specimens and in some species a character has the 
value 0 (does not exist) in the first intervals.— Example : In the great 
majority of the specimens of Mnium hornum the teeth at the margin of the 
leaves and on the vein (at the back of the leaf) do not exist jn the lowest 
leaves. See Table XI. 
TABLE Al. 
Muium hornum.—Gradation of the number of teeth (1) at the margin of the 
leaves and (2) on the nerve. One stem ; interval curves. 
Intervals: 1. 3. 4, 5. 6. ve 8. 9. 10. 
2 
Teeth: margin...... 0 0 il 14 32 42 50 53 59 65 
nerve dou or 0 0 0 0:2 d 3 5 7 7 10 
» 
