Ueber einige deutsche und verwandte 
Equiseten-Formen. 
Von 
Dr. J. Milde. 
Vorgelegt in der Sitzung vom 6. Mai 1863. 
1. Equwisetum trachyodon Al. Braun. Flora 1839, 1. p. 308. 
Synon. E. hiemale var. trachyodon Doell Rhein. Flora. 1843. p. 32% 
et Gefässkryptog. d. Grossh. Baden 1855 p. 69. — Al. Braun 
Monograph. der Nordam. Equiseten in Sillim. Amer. Journ. of 
Science and Arts. Vol. XLVI. 1844. 
E. Mackaii Newm. in Ch. C. Babington’s Manual of brit. 
botany. 1843. 
E. elongatım Hook (non Willd.!) Brit. Flora ed. V. 
Diagnose. 
Caulis viridis, scaber, 8—10—12-—A4angulus, carinae latae truncatae 
lineis duabus tuberculorum distinctis notatae, vaginae eylindraccae, appressae, 
superiore parte plus minusve nigrae, 21,‘ altae, 1'%‘‘ amplae, foliola 
distincte Acarinata, sulco medio profundo, dentes persistentes, lanceolato- 
subulati, asperi, atrofusci, inferiore parte late albo-membranaceo-marginati 
sulco medio profundo apicem non attingente. 
Lacuna centralis vix tertiam caulis partem explens, carinales minimae 
valleculares amplae rotundae et obovatae, parenchyma viride ut in E. 
hiemali, liber carinalis 10—12, vallecularis 4—5 cellulas altus, stomatum 
series unilineatae, altera ab altera 6—11 cellulis disjuncta, valleculae rosulis 
serialibus dense obtectae, carinae medio concavae, dentes dentieulis erecto- 
patentibus dense vestiti. 
62 * 
