2 ARKIV FÖR BOTANIK. BAND 17. N:0 3. 



the whole number thus being 14—16 (12—18). Spore-bearing 

 cones about 20 mm long and 12 mm broad, the scutella of 

 the sporophylls hexagonal, 2—3 mm in diameter. Rhizomes 

 resembling the aerial stems, but with the surface more ir- 

 regular and not so distinctly furrowed; tubers 15 mm long 

 and half as broad. 



The specimens were collected in 1878 by Ernst Ulffers, 

 at that time mining engineer at the colliery of Höganäs. The 

 fossiliferous rock is a typical grayish shale. In many of the 

 specimens the cuticle of the stems is present in a carbonized 

 state and can be detached in the shape of long strips. We 

 do not, however, get the best information about the plant 

 from these carbonized remains but from the impressions, 

 which as a rule are very distinct, smooth and a little glossy. 

 It is remarkable that the specimens of the rock are almost 

 entirely without remains of other plants. 



This species is interesting chiefly because almost every 

 part of the plant is preserved. Unfortunately, however, the 

 spores are missing. In regard to the parts preserved the 

 species does not show any characteristics that could prevent 

 it from being ranged under the genus Equiseium. 



In some species of Equisetites, Prof. Halle has been able 

 to find spores, which are different from those of the existing 

 species of Eqvisetum (Halle 1908). Maceration experiments 

 were made on sporopbyll-fragments of the present species; 

 but, as has already been mentioned, the result was negative. 

 Some stem-fragments were also treated in the same way. 

 When the fragments had been for about a fortnight in the 

 maceration solution, it was possible to observe that the stem 

 was provided with stomata, which were situated in regular 

 longitudinal rows on the internodes. Their shape seemed to 

 be the same as that of the recent Equisetacece. A cuticular 

 structure was plainly visible, consisting partly of thin longi- 

 tudinal lists with very short, rib-like protuberances lying 

 close together and standing out at right angles, partly of 

 shorter transversal dotted lines. When ammonia was added, 

 the whole preparation gradually dissolved, so that no draw- 

 ings could be made. 



Fig. 1 gives a tolerably good illustration of the ordinary 

 aspect of the plant. It must have been of medium size 

 and much smaller than, for instance, the closely related 



