12 ARKIV FÖR BOTANIK. BAND 13. N:0 7. 



eral others of the same kind occur in the collection, but 

 none of the specimens show any nodes or any traces of leaf- 

 sheaths. Their equisetaceous nature is probable only because 

 of the existence of very distinct longitudinal ribs on the im- 

 pressions (or interior casts), which evidently correspond to 

 decorticated interior surfaces. Fragments of this nature have 

 often been described under the names Schizoneura and Phyllo- 

 theca. The genus Equisetites, however, in a decorticated 

 state, has exactly the same kind of ridges; and it is evident 

 that, in specimens of this kind, the three genera mentioned, 

 as well as Neocalamites, cannot be distinguished from each 

 other. 



Stem-fragments of Equisetites? (Cf. E. Müyisteri Stbg.) 



PI. 1, figs. 20, 21. 



The stem-fragments shown in pi. 1, figs. 20 and 21, are 

 probably of equisetaceous nature, and may well belong to 

 the genus Equisetites. As compared with those shown in 

 figs. 18 and 19 of the same plate, they are distinguished by 

 much broader furrows between the ribs. In regard to this 

 character there is an undeniable resemblance to Equisetites 

 Münsteri Stbg., but as no leaf-sheaths or nodes are preserved, 

 a definite determination is impossible. 



Cladophlebis cf. iiebbeiisis (Brgn.) Nath. 



PI. 1, figs. 22, 23; pi. 2, figs. 1, 2. 



[For reference see Möller: Bidrag till Bornholms fossila flora. Pte- 

 ridofyter. Lunds Univ. Årsskr. Bd 38- Afd. 2. N:o 5. 1902. {Cladophlebis 

 Roesserti, p. 27, and C. nebbensis, p. 29.)] 



In the rust-coloured sandstone of Rödaisberg there occur 

 a couple of small fragmentll of a Cladophlebis which may be 

 compared with G. nebhensis (Brgn.) Nath. — this species 

 being taken in a wide sense, as including also C. Roesserti 

 (Presl) Sap. 



The best specimen is the one figured in pi. 2, figs. 1 and 

 2. It consists of two pinnules, evidently attached to a pinna- 

 rachis. The pinnules are about 12 mm. long, fairly narrow, 

 falcate and acute. Their secondary veins are directed for- 



