50 PROF. JULIUS MACLEOD ON TEN 
Taste XXIV. 
Description of Mnium undulatum, Linn. 
A.— Specific limits of variation. 
[Great Britain: Manchester ; Bolton Abbey. | 
1. Length of the leaves: 6:903-15:58 mm. 
2. Breadth of the leaves: 1:71-2:35 mm. 
3. » ^ 5 at their base: 1:02-1:47 mm. 
4. » » cells: 17-28 y. 
5. Number of cells: 76-103. 
6. Breadth of the border: 40-97 p. 
7. Number of cells of the border: 6-11. 
8 marginal teeth : 84-134. 
9 double marginal teeth : 0. 
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” 
10, P teeth on the nerve at the back of the leaves: 0. 
11. Length of the nerve: nerve always reaching the summit. 
12. Tooth at the summit of the leaves: always existing. 
13. Number of leaves: 33-58 (or more ?). 
14. D fruits: 2-8 (the fertile stem is sometimes ramified, the branches being 
fertile; the fruits of such lateral branches are not taken into account). 
B.—Gradation of the characters. 
[Two patches: Manchester, 7 stems with about 210 leaves, the leaves above 
the longest leaf being excluded. ] 
Intervals: 1. 2. 3. 4. 5. 6. i 8. Oy 16 
Length leaves (mm.) ...... 159 235 3:72 540 627 678 823 854 894 10:15 
Breadth leaves (mm.) .... 1°55 165 189 225 2:20 212 222 218 212 209 
base. (MM) «e. ses 1:32), -1:89.°. 102 1:82...1-80 1/70 1:69 1:54 148 1:26 
5 Gell (A) obesse vs 22 22 22 22 21 21 21 21 21 21 
INOMIDEY COMA Ls 2 st sas 850. 71. 16. Ole 98. 4 89...) 00a 89. . 80 
Breadth border (#)........ 81 82 84 85 8T 86 .. M5 88 488 78 
Welle border 2. xs... 100195: 122 11a 19. | IL... 14 LE Al 9 
Marginal teeth .......... 29 48 66 87 96. 102 109. 115 .116 119 
Double marginal teeth ..,, O 0 0 0 0 0 0 0 0 0 
APELI DOTO. Wi... 3s SFO 0 0 0 0 0 0 0 0 0 
Mongth (3 42) 2 BR SNR T— +- +t +24 +t +t +4 +t + E 
TOt SUING sissies. vi + + + + + + + + E + 
