536 G. T. HARRIS, MICROSCOPICAL METHODS IN BRYOLOGICAL WORK. 



Brachythecium rutabulum. 



One of the commonest and most variable of the British mosses. 

 The type is not difficult to recognise, but the varieties with very 

 acuminate leaves are difficult to determine, especially when 

 barren, as they often are. 



Hypnum cupressiforme. 



This again is a very variable form, and its varieties differ 

 widely from the type. The var. resupinatus has had specific 

 rank from many authorities, but it certainly differs no more 

 from the type than does the var. jUiforme. 



Journ. Quekett Microscopical Club, Ser. 2, Vol. XII., A'o. 76, April 1915. 





