10. Equisetum xylochaetum Mettenius. 



10. Equisetum xyIocIi«aeüim Mettenius. Filices Lechleriaiiae. Fasic. 



II. 1859. *p. 34. 



Syn. 1856. E. 1 Poeppigianum Mettenius Filic. Lecliler. Fase. I. 

 1856. p. 27. 



„ 1861. E. gigaiiteiim W. J. Hooker in A Second Century of 



Ferns. 1861. Tab. 74. 

 „ 1861. E. Lechleri Milde Verhandig. der zool.-botan. Gesellsch. 



in Wien 1861. p. 350. 



E. giganteum Besser in herbar. reg. Berolin. 



I> i a »• 11 o s i 



Gaulis palhdus laevissimis non sulcatus, carinae 30 — 40 valle- 

 cuhs angustiores convexae, vaginae cyhndricae pallidae, foliola plana 

 lineis tuberculorum singulis nuirginalibus notata, dentes lanceolato- 

 lineales aterrimi rigidi sublignosi sola infimä basi sulcati bini-quaterni 

 apice connati plerumque truncati basi liberu persistentes, sulcus com- 

 missuralis angustissimus superne ampliatus, ochreola tota cum sequenti 

 internodio epidermide disruptä obvelata. Rami verticillati 7 — 8 an- 

 guli, carinae scabrae, fohola tricarinata, dentes lanceolato-acuminati 

 sphacelati albi maculä media coloratä. 



Epidermis nuda guttuhs silic. densissime infareta, stomatum 

 cryptop. series 2 — 3 lineatae 16 — 20 cellulis interpositis, liber cari- 

 nalis altissimus, lacuna centraHs amplissima, cai'inae ramorum tuber- 

 culis cuboideis exasperatae, valleculae nudae; spicae rhachis solida. 



