BRITISH SPECIES OF THE GENUS MNIUM. 51 
PART V. 
TABLES OF IDENTIFICATION. 
§ 39.—In the present part I give tables of identification for the ten species 
of Mnium which are described in Part IV. — The British Flora includes four 
species (lycopodioides, Schwaeg., riparium, Mitt., stellare, Reich., cinclidioides, 
Blytt) which are not mentioned in the tables ; these are rare (or very rarely or 
never found in fruit) in the British Islands. In each table the minimum and 
maximum limits of the character under consideration are given separately. 
In the descriptive tables (Part IV.) the figures are given as they were 
observed. As the limit-values are hitherto merely approximate, they are 
MODIFIED in the tables of identification in the following way :— 
I'. The minimum figures are diminished by about 5 per cent. of the 
observed value, and for three species (affine, orthorrhynchum, 
spinosum, see $ 38, p. 40) by about 10 per cent, 
Z'. The maximum figures are augmented by about 5 per cent. of the 
observed value, and for the three mentioned species by about 
10 per cent. 
By these modifications (which are arbitrary) the limits between which 
variation may occur are widened by about one-tenth (or one-fifth) in order 
to diminish the possibility of mistakes in identifying a given specimen. 
Despite this, it is advisable to be prudent in the use of the tables and to 
allow a wide range of error, as we have done in § 17 (see p. 26), in which 
the THREE METHODS of using the tables are illustrated by examples. 
ABBREVIATIONS : see $ 38, p. 40. 
TABLE XXV. (see § 25). 
Length of the leaves in the 10th interval (mm.). 
Minimum. Maximum. 
CURATO: ESPERE 2°36 RCNP OUUM ...: ELS 4:95 
orthorrhynchum ........ 2:70 orthorrhynchum ........ 5:94 
SUO IQUOSQIN seo RE 3:44 subglobosum | .......... 7T'10 
QUADIdQTU ee esci ss 3°55 cuspidatum |. esses. 7T'8l 
Unda woes occ es 4:12 BOW o ee bw 8:46 
piegata Sye iei die. eins 4:12 DEA aaran ri C. OR LU 8:73 
PROUN e i oea ae 4:50 EORUM a e C oo B RORIS 8:91 
HET t E S ER 4:90 Ce Rees RR 9:17 
OH LS NCC 4:90 BELAUN Lies enin 9:67 
undulatum ........ eee, 6:60 undulatum eee 16:36 
