23. Equisetum trachyodon A. Br. 
23. Equisetum trachyodon A. Br. in Regensburger botan. Zeitung 
1838. Nr. 10 p. 169 et 1839 Nr. 1 p. 308. 
Syn. 1543. E. Mackai Newman in Ch. C. Babington Manual of 
British Botany. London’ 1843 p. 381. — Hooker Brit. 
Flora. Edit. VI. 1850 p. 582. 
1843. E. hiemale D) trachyodon A. Br. in Doell's Rheinisch. 
Flora 1843 p. 32. 
„ 1843. E.hiemale ? Mackaii Newm. Phytologist 1845. p. 505. 308. 
„ 1844. E. hiemale 7 trachyodon A. Br. in Silliman Americ. 
Journal of Science and Arts. Vol. XLVI. 1844. p. 90. 
„ 1848. E. hiemale €. trachyodon  Rabenhorst Deutschlands 
Cryptogamen-Flora. Bd. II. p. 396. 1848. 
„ 1850. E. elongatum W. J. Hooker and G. A. Walker-Arnott 
in Brit. Flora. Ed. V. 
E. intermedium A. Br. olim msc. 
Diagnosis. 
Caulis nudus viridis scaber, carinae 8—12— 14 latae lineis 
tuberculorum duabus sulco disjunctis vestitae, vaginae . cylindrieae 
longiores nunquam truncatae, foliola distintissime 4 carinata sulco 
medio lato profundo in dentes persistentes lanceolato-subulatos asperos 
excurrente. 
