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BRITISH MOSSES. 



I. Leaves lanceolate, acute, no distinct per •ichcetium, teeth of 

 peristome variable. 



Fig. 9. Weissia conteoversa. 

 Controverted Moss (a) . 



Colour. Bright green. 



Stems. Half-inch long, branched. 



Leaves (b) . Lanceolate, nerve strong, excurrent, margin curved inwards. 

 Capsule. Oblong-oval, nearly erect ; seta twisted when dry. Spring. 

 Locality. On banks. 



A new species of moss has been discovered by Mr. Wilson near Holyhead, 

 between Gymnostomum tortile and Weissia controversa, and it is probable that the 

 genera may in time be re-arranged. 



Fig. 10. Weissia densifolia. 



Thick-leaved Weissia (a) . 



Colour. Bright green. 



Stems. Half-inch long or more, often branched. 



Leaves. Lanceolate, very thick, longer and stouter than in controversa ; nerve 

 strong, excurrent. 



Capsule. Oblong, nearly erect, seta twisted, longer than in controversa. Spring. 

 Locality. Banks. 



It is doubtful whether this moss is a variety of controversa or a distinct species. 

 W. Controversa has many varieties, and it and the two last species of Gym- 

 nostomum are sometimes only distinguishable by the presence or absence of the 

 peristome, which in the variety W. Gymnostomoidcs (naked-mouthed) is almost 

 wanting. 



