Contributions to the carljoniferous Flora of North-eastern Greenland. 343 



ISphenophyllales. 



Sphenophyllum tenerrimum Ettingshausen var. 

 elongatum D. White. 



PI. XV, Figs. 11—22. 



The collection contains several stem-fragments and some leaves 

 of a small Sphenophyllum, which belongs to the tenerrimum-type. 

 It differs, however, from this species by the somewhat larger size 

 of the verticils and by the leaves being more divided and often 

 petiolated ; the internodal parts of the stems are generally longer 

 than those of the typical Sphenophyllum tenerrimum. Dr. R. Kidston 

 has kindly called my attention to the variety elongatum described 

 by Dr. D. White \ and as far as concerns the verticils there seems 

 indeed to be a complete accordance with the Greenlandic plant ^. 

 As Dr. White says nothing about the length of the internodes, I 

 have not been able to ascertain if there is coincidence in this 

 respect also, but this is of little importance since a difference in 

 this point may be due to the outer conditions under which the 

 plants have grown. 



Cala mariales. 



Asterocalamites scrobiculatus S с h 1 о t h e i m sp. 



PI. XV, Figs. 7—10. 



Only two fragments — the specimens fig. 7 and lig. 9 — both 

 on the same slab, have been found; and it is probable that these 

 have originally belonged to the same individuum. The specimen 

 fig. 7 represents a compressed stem about 18 millimeters in diameter 

 with pretty distinct longitudinal ribs, in the middle of which there 

 is a furrow (figs. 8, 10). No nodal lines are to be seen, but the 

 nodes are indicated by the ribs being somewhat "swollen" at regular 

 intervals (at a, b and с fig. 7). At с the node is also very clearly 

 indicated by the arrangement of the fine striae between the ribs 

 as distinctly seen under the microscope (fig. 8). The small fragment 

 fig. 9 (magnified fig. 10) represents a part of the surface at the node 

 with the "swollen" ribs. 



According to a kind communication by Dr. Kidston, the nodes 

 of Asterocalamites scrobiculatus "are sometimes not distinguishable, 

 from the absence of a definite line, but they are often indicated by 

 swollen or gently uprising protuberances". 



^ D. White, The stratigraphie succession of the fossil floras of the Pottsville for- 

 mation in the southern anthracite coal-field, Pennsjivania. In the 20tli Ann. 

 Rep. U. S. Geol. Survey. Washington 1900. 



- When only leaves and no stem fragments are present it may be difficult to 

 decide if the leaves belong to this type of Sphenophylliini or to Asterocalamites. 



