BRITISH SPECIES OF THE GENUS MNIUM. ; 4T 
TABLE XXI. 
Deseription of Mnium serratum, Schrad. 
A.— Specific limits of variation. 
(Great Britain: Ben Lawers, Ingleton, High Force, South Wales, 
Gilsland Alston, Craven.— Canada. | 
. Length of the leaves: 2:-49-4:71 mm. 
. Breadth of the leaves: 0:59-1:31 mm. 
E " » at their base: 0:88-0:71 mm. 
E 
5 » cells: 17-25 gp. 
. Number of cells: 98-57. 
. Breadth of the border: 36-101 p. 
. Number of cells of the border; 5-9. 
5 marginal teeth: 11-29. 
OPNP PP 
a double marginal teeth: 6-21. 
10, i teeth on the nerve at the back of the leaves: 0. 
ll. Length of the nerve: nerve always reaching the summit in Great Britain. (Canada: 
ZONE) p 
12. Tooth at the summit of the leaves : always existing. 
13. Number of leaves: 16-36. (Great Britain: 21-36. Canada: 16-24.) 
14. » fruits: 1. ; : . 
B.—Gradation of the characters. 
[One pateh : Ben Lawers, 9 stems.— Barker leg., July 1870.] 
Intervals: ^ 1. | 20 E b 16 c8 470. 10. 
Length leaves (mm.)...... 144 1°70 1:96 215 2:87 92:62:9-79 3:09 3-48 408 
Breadth leaves (mm.) .... 0°63 078 087 101 1:09 119 126 1:29 1-29 113 
Ec pase (im. ...... 047 0:50 051 053 0:56 059 059 0:57 0:52 052 
come EY (79 oa. s ess l/ eee S0 2].* 99 10h 08.95 Ves 
P. INTIBDEROOISS e eere neret 37 40 4l ae AG AT, 50 50 50 48 
am Breadth border (g) ........ . 54° Sees Ole SO . 08 690 1709 901 76. 78 
ISTIS DOLdBE sik. wes cscs 85 8 9 D 88 Shee INB 75. TO 
Marginal teeth .......... 0- 0 E One T6 5 84 12 T7 18 16 
Double marginal teeth .... 0 0 0 05.08. Stow age, 12" '12 1l 
MEPRh CTV 2.0005 ees n 0 0 0 0 0 0 0 
Wength nerve .........-++ t- t— F- F- +- +E tt +- + ME 
Tooth EINIDES 2.25508 + + + uen p HE + FiF g 
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