23. Equisetum trachyodon A. Br. 



23. Eqnisetum trachyodon A. Br. in Regensburger botan. Zeitung 

 1838 Nr. 10 p. 169 et 1839 Nr. 1 p. 308. 



Syn. 1843. E. Mackaii Newman in Ch. C. Babington Manual of 



British Botany. London 1843 p. 881. — Hooker Brit. 



Flora. Edit. VI. 1850 p. 582. 

 „ 1843. E. hiemale D) trachyodon A. Br, in Doell's Rheinisch. 



Flora 1848 p. 82. 

 „ 1843. E. hiemale ß Mackaii Newm. Phytologist 1843. p. 305. 808. 

 „ 1844. E. hiemale y trachyodon A. Br. in Silliman Americ. 



Journal of Science and Arts. Vol. XL VI. 1844. p. 90. 

 „ 1848. E. hiemale C. trachyodon Rabenhorst Deutschlands 



Cryptogamen-Flora. Bd. II. p. 836. 1848. 

 „ 1850. E. elongatum W. J. Hooker and G. A. Walker-Arnott 



in Brit. Flora. Ed. V. ' 



E. intcrmedium A. Br. olim msc. 



T> i 21; g- 11 o i i^. 



Caulis nuduH viridis scaber, carinae 8 — 12 — 14 latae Hncis 

 tubcrculorum duabus sulco disjunctis vestitae, vaginae cylindricae 

 longiores nunquam truncatae, foHola distintissime 4 carinata sulco 

 medio lato profundo in dcntes })ersistcntes lanceolato-subulatos asperos 

 excurrcnte. 



