436 FLORA OF THE CARBONIFEROUS PERIOD. 



Like S obovata, Lesqx. but with narrower ribs, and larger and 

 less distant areoles, each with a slight groove above. 



21. S. Dournaisii, Brongt. 

 M. C. Joggins, J. W. D. 



22. S. Knorrii, Brongt. 

 M. C. Sydney, R. Brown. 



Syringodendron, Brongt. 

 Obscure specimens, referrible to a narrow-ribbed species of this 

 genus, occur in the lower carboniferous beds at Horton and Ons- 

 low. 



Stigmaria, Brongt. 

 Stigmaria ficoides, Brongt. 



Under this name I place all the roots of Sigillarice occurring 

 in the carboniferous rocks of Nova Scotia. They belong, without 

 doubt, to the different species of sigillaroid trees, but it is at pre- 

 sent impossible to determine to which ; and the specific characters 

 of the Stigmariae themselves are, as might be anticipated, evanes- 

 cent and unsatisfactory. The varieties which occur in Nova 

 Scotia, discarding mere differences of preservation, may be arranged 

 as follows ; 



Variety (a) Areoles large, distant; bark more or less smooth. 

 This is the most common variety, and extends throughout 

 the coal formation. 

 u (6) Areoles large, separated by waving grooves of the 



bark. 

 " (c) similar, but ridges as well as furrows between the 



areoles ; var. undulata of Goeppert. 

 *' (cZ) Areoles small, separated by waving grooves. 

 *' (e) Areoles moderate, in vertical or diagonal furrows sepa. 



rated by ridges ; var. sigillarioides of Goeppert. 

 •*' (/) Areoles small, bark finely netted with wrinkles or 



striae. 

 " (<7) Areoles surrounded by radiating marks, giving a star- 

 like form ; var ; stellata of Goeppert. The only specimen 

 I have seen was found by Dr. Harding in the lower car- 

 boniferous coal measures of Horton 

 a (h) Areoles small or obscure and n.requent. Surface 

 covered with fine uneven striae. My specimens were col- 

 lected b^ Mr. Brown in the middle coal measures at Syd- 

 ney 



