172 ENGLISH BOTANY, 



Newman in 1842, in which year he published descriptions of the 

 British Equiseta in the ' Phytologist,' though in the 2nd edition of his 

 ' British Ferns,' published in 1844, he described E. Mackaii (E. trachy- 

 odon) and E. variegatum as distinct from E. hyemale ; but he marked 

 the names of these species with a dagger, thus indicating they were 

 " species whose distinctness I do not consider to be at present clearly 

 proved." Dr. Stenzel, in Cohn's ' Kryptogamen Fl. von Schlesien,' 

 includes under E. hyemale as subspecies E. ramosissimum, Desf., E. 

 hyemale genuinum with its var. Schleicheri (Moorei) and E. variega- 

 tum, Schleicher ; and certainly all these forms pass so insensibly into 

 each other, that I feel much inclined to follow his example. Still 

 there seem sufficient differences to divide the subdeciduous E. hyemale 

 with its form Moorei from the truly evergreen British Equiseta. E. 

 trachyodon should probably be considered as but a subspecies of 

 E. variegatum, but I think it is more than a variety ; the living plant 

 looks much more distinct from the forms of E. variegatum than do 

 dried specimens. 



Variegated Horsetail. 



EXCLUDED SPECIES. 



EQUISETUM RAMOSUM. Schleicher. 



Said by Schkuhr to grow in Wales, but no authority is given. 

 This is the plant now generally called E. ramosissimum, Desf. 

 It occurs in the West of France, as far north as the valley of the 

 Loire, and may possibly occur in Britain, as it might be passed as 

 a form of E. variegatum. I have seen no Welsh specimens of 

 E. variegatum, though it is reported from Carnarvon. 



