Equisetum.'] eqtjisetace^. 365 



Sib. (under E. variegaturri). In Ballyharrigan Grlen, near 

 Dungiven, Derry; and in several glens near Glenarm, 

 Antrim; D.M. 



This is not always easily distinguished from large specimens 

 of E. Wilsoni. The sheaths are sometimes marked with 

 white in the upper portion of the stem, usually black above 

 and green in their lower portion, ultimately wholly black. 

 Some specimens, almost decumbent, gathered on the sandy 

 shore of Lough CuUin come very near to JE. Wilsoni, except 

 that their sheaths are more black, and the deciduous teeth 

 longer. These teeth have a black centre, when young (as 

 seen usually on the upper part of the stem), but become 

 altogether membranous white when older. 



After a series of careful observations made in Antrim, Mr. 

 D. Orr considers that the normal state of E. trachyodon is 

 the unbranched form. In exposed situations, when broken 

 by the wind or injured by cattle, the stems throw out lateral 

 shoots from near the point of injury. Mr. Orr has found 

 that the plant is easily propagated from cuttings of the 

 plant containing three or four joints. 



E. Wilsoni (Newman). 

 Districts l_--5 6------ 



Jlare. — 1. Ditches bordering on the lake in Mucruss 

 demesne, Killamey (Mr. Wilson) ; Brit. Flor., &c. — 5. Along 

 the Eoyal Canal, east of Clonsilla station, Dublin, abundant 

 for a considerable distance ; D. M. Sparingly on the bank 

 of the same canal a little below the bridge at "Cross 

 Guns ;" near Glasnevin ; A. O. M. — 6. Margins of a pool 

 of water on the "Hunting Course" field, west of Castle 

 Taylor, Galway ; A. 0. M. 



This is 'more nearly allied to E. variegatum than to any 

 other of the previous sub-species, and continues erect when 

 cultivated in garden soil. In the wild state it grows in 

 shallow water. The stems are more slender and the sheaths 

 marked with much less black than in E. trachybdon. The 

 teeth of the sheath are shorter, blunter, and more per- 

 sistent. 



