277 



low Mill Green, and Heaton wood ; in Cumberland, Lowgelt-bridge ; 

 in Durham, woods about Derwent bridge and Castle Eden Dean ; in 

 Yorkshire, woods at Castle Howard and Kirkham, Rigby woods near 

 Pontefract, near Ingleton and Halifax, about Leeds, Hackfall, near 

 Huby, Laver Banks and Mackershaw wood, on the banks of the Skell 

 by Ripon ; in Cheshire, near Arden Hall, in a wood close to the river ; 

 in Norfolk, on St. Faith's bog and Arming Hall wood, near Norwich ; 

 in Nottinghamshire, about the middle of Nettleworth Green, two miles 

 from Mansfield, plentifully among the rushes ; in Warwickshire, in a 

 moist ditch near Middleton ; in Cambridgeshire, Stretham Ferry and 

 Gamlingay Bogs ; in Bedfordshire, Potton Marshes and Ampthill 

 Bogs ; in Wiltshire, in a rivulet near Broadstitch Abbey, plentifully. 

 The same authors have recorded two Welch habitats : — in Denbigh- 

 shire, on the west side of the brook that runs from Henllan Mill into 

 the river Elwy, about 300 yards from Trap Bridge, less than a mile 

 from Garm, and in Flintshire, near Maesmynnan. Through the kind- 

 ness of Dr. Greville, Dr. Balfour and Dr. Campbell, I have received 

 specimens from several Scotch habitats, more particularly in the vici- 

 nity of Edinburgh. Mr. Kippist informs me that he has 

 seen it in abundance in the woods about Corra Lyn, 

 Lanarkshire. In Ireland, Mr. Mackay and Mr. Moore 

 have found it in the counties Dublin and Wicklow. 



The roots are strong, black and frequently divided ; b^y. 

 the rhizoma or underground stem is creeping, jointed, W 

 branched, and with age extends to a great length : at V, 



the joints it is solid, but between them it is par- 

 tially hollow, the interior being occasionally more 

 or less divided by longitudinal septa. The stems 

 are generally erect, and, when divided, the branch 

 is lateral, and issues from the main stem imme- 

 diately below the base of one of the sheaths; a 

 stem has rarely more than a single branch. The an- 

 nexed figure represents a branched specimen, for 

 which I am indebted to Dr. Greville : it is fi'om Ros- 

 lin woods, near Edinburgh. 



The engraving at the head of this article represents a stem of fine 

 but not extraordinary growth : the stem has been divided into six por- 

 tions in order to exhibit the whole at a single view ; its diameter 

 and length, together with the distances between the sheaths, have 

 been faithfully copied. The sheaths in the sjiecimen figured are 

 fourteen in number, the internodes decreasing in length towards 



