THE FLORA OF THE COAL FORMATION. 475 



Striate, 0*35 inch wide. Scars nearly as wide as the ribs, rounded, hex- 

 agonal, one inch distant ; lateral vascular marks narrow, central large. 

 On the ligneous surface scars single, round, oblong ; bark very thin. 

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



12. S. (?) A small erect stem, somewhat like S. flexuosa. 



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



13. S. (Clathraria) Menardl^ Brongn. M. C, Sydney (R. Brown), 

 U. C, Pictou (J. W. D.). 



14. S. [Asolanus) Si/dnensis, spec. nov. Ribs obsolete; cortical 

 and ligneous surfaces striate ; vascular scars two, elongate longitu- 

 dinally, and alike on cortical and ligneous surfaces ; scars 1-1 inch 

 distant, in rows 0-6 inch distant. Stigmarian roots, same with 

 variety h of Stiffmaria, as described below. M. C, Sydney (R. Brown). 



15. S. organum^ L. and H. M. C, Sydney (R. Brown). 



16. S. elongata, Brongn. M. C, Sydney (R. Brown). 



17. S. flexuosa^ L. and H. M. C, Sydney (R. Brown's list in 

 "Acadian Geology"). 



18. ;S^. pachyderma^ L. and H. M. C, Sydney (R. Brown's list). 



19. &. [Fav.) Bretonensis, spec. nov. (Fig. 161, F). Like S. tessel- 

 lafa, but areoles more hexagonal, hark thin and smooth on both sides, 

 and furrow above the scars arcuate and with a central punctiform 

 elevation. M. C, Sydney (R. Brown). 



20. S. eminens^ spec. nov. (Fig. 161, H). Like 8. obovata, Lesqx., 

 but with narrower ribs, and larger and less distant areoles, each 

 with a slight groove above. M. C, Sydney (R. Brown). 



21. S. Dournaisii, Brongn. M. C, Joggins (J. "VV. D.). 



22. S. Knorrii, Brongn. M. C, Sydney (R. Brown). 



Syringodendron, Brongn. 



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

 genus, occur in the Lower Carboniferous beds at Ilorton and Onslow. 



Stigmaria, Brongn, 



Stigmariajicoides, Brongn. (Fig. 30, d). 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 Sigil- 

 larioid trees ; but it is at present im[)Ossiblc to determine to which ; 

 and the specihc characters of the Sligmarlcc themselves are, as might 

 be anticipated, evanescent and unsatisfactory. The varieties which 

 occur in Nova Scotia, discarding mere difference of preservation, may 

 be arranged as follows : — 



