DET WT 
BRITISH SPECIES OF THE GENUS MNIUM. 49 
Taste XXIII. 
Description of Mnium subglobosum, Bruch, Schimp. & Guemb. 
A.— Specific limits of variation. 
[Great Britain: Benson Knot (Kendal), Whaley Bridge, 
Hathersage, Derbyshire.] 
. Length of the leaves: 3:62-7:33 mm. 
: Breadth of the leaves: 2:95-5:50 mm. 
at their base: 0:58-0:98 mm, 
d 
» ” ” 
A » cells: 38-54 y. 
. Number of cells: 71-100. 
. Breadth of the border: 53-85 p. 
. Number of cells of the border: 4-6. 
jd marginal teeth: 0. 
OM ASMP ow 
double marginal teeth: 0. 
teeth on the nerve at the back of the leaves: 0. 
” 
m" 
e 
” 
. Length of the nerve: nerve never reaching the summit. (Very rarely a trace of 
T 
-— 
connection between nerve and summit in the third leaf above the longest one. 
Nerve sometimes reaching the summit in the phyllomes of the perianth.) 
12. Tooth at the summit of the leaves: never existing. (A trace of a tooth in the above- 
mentioned exceptionalleaf. The phyllomes of the perianth sometimes with a tooth.) 
13. Number of leaves: 7-i4. 
14. a fruits: 1-2. 
B.—Gradation of the characters. 
[One patch: 11 stems with about 70 leaves in good condition ; many leaves 
were spoiled and not measurable, especially in the intervals 1-5. 
Benson Knot, Kendal.] 
Intervals: 1. 2. 3. 4. 5. 6. ts 8. 9. 10. 
Length leaves (mm.)...... 1:34 2:04 2°58 3:08 2:06 3°65 413 4°77 6:00 579 
Breadth leaves (mm.) .... 1:07 1:59 1:99 2°56 2°31 2:86 3:28 8:80 3870 441 
» base (mm.) ...... 0-56 0:05 073 073 0-69 074 068 071 077 078 
COMED) Eiee 31 36 38 42 3s 41 41 45 44 47 
Mmmm ber Cols Ging. cs. ss 20. Wl 500. 50 .00 20 7B 75> 9] 
Breadth border (u)........ 59 606 65 08. 65. 05 2027 | Bl 63 65 
BULbonder $3.60 4 4 4 5 5 5 5 5 5 5 
Marginal teeth .......... 0 0 0 0 0 0 0 0 0 0 
Double marginal teeth .... 0 0 0 0 0 0 0 0 0 0 
ENDE. .oeeecnnennn 0 0 0 0 0 0 0 0 0 0 
length nerve ........ se AS - E imr - -= 
lg mit. se ooo eia oo — — — — — — — — _ 
LINN. JOURN.— BOTANY, VOL. XLIV, E 
