Fossilium Gatalogus 
II: Plantae. 
Editus a 
W. Jongmans. 
Pars 7: 
W. Jongmans 
Equisetales Y: 
Calamitina—Endocalamites. 
Laboratory of 1Ö3V 
W. Junk 
Berlin W. 15. 
1915 
