THE FLORA OF THE COAL FORMATION. 487 



vessels, exterior to which is a thick cylinder of cellular tissue and 

 bast fibres, and a dense outer bark. Var. verticillatum has the areoles 

 arranged in regular decussate whorls instead of spirally. This dif- 

 ference, which might at first sight seem to warrant even a generic 

 distinction, is proved by specimens in my possession to be merely a 

 variety of phyllotaxis. This species is eminently characteristic of the 

 Lower Carboniferous Coal measures, and has not yet been found in 

 the Middle Coal formation. Fragments of bark, resembling that of 

 this species, occur in the Coal formation of Bay de Chaleur, along 

 with leafy branches of Lepidodendron^ which resemble those of this 

 species, though, I believe, distinct. L. C, Ilorton, etc. (C. F. Ilartt ; 

 J. W. D.) ; Norton Creek, etc.. New Brunswick (G. F. Matthew). 



2. L. Pictoense, spec. nov. (Fig. 169, A). Areoles contiguous, pro- 

 minent, long oval, acuminate, separated in young stems by a narrow 

 line ; breadth to length as 1 to 3, or less ; lower half obliquely 

 wrinkled, especially at one side. Middle line indistinct. Leaf-scar 

 at upper end of areole, small, triangular, with traces of three vascular 

 points, nearly confluent. Length of areole about O'S inch. Leaves 

 contracted at the base, widening slightly, and gradually contracting 

 to a point ; ribs three, central distinct, lateral obscure ; length 1 inch. 

 Cones borne at the extremities of the smaller branches, oblong, 

 obscurely scaly. In habit of growth this species resembles L. ele- 

 gans, for which imperfect specimens might be mistaken. It is also 

 near to L. hinerve and L. patulum, Bunbury." It abounds in the 

 Middle Coal measures. M. C, Sydney (R. Brown) ; Pictou (H. Poole 

 and J. W. D.) ; Grand Lake (C. F. Hartt). 



3. L. rimosum, Sternberg (Fig. 169, D). M. C, Sydney (R. 

 Brown) ; Joggins (J. W. D.). 



4. L. dichotomum, Sternberg [L. Sternbergn, L. and IL). M. C. 

 Sydney (R. Brown) ; Joggins (J. W. D.) ; L. C, Ilorton (J. W. D.). 



5. L. deciirtatum, spec. nov. (Fig. 170, A). Areoles approximate 

 or separated by a shallow furrow, rhombic ovate, obliquely acuminate 

 below, nearly as broad as long, wrinkled transversely, especially on 

 the middle line, which a})pears tuberculatcd ; vascular scar rhombic, 

 twice as broad as long, with three approximate vascular points. In 

 some flattened specimens the line separating the areoles is indistinct, 

 and the scars appear on a transversely wrinkled surface without dis- 

 tinct areoles. M. C, Pictou (J. AY. J).). 



6. L.undidaturn, Htcrnherg. [Fig. 169, E). Possibly several species 



* III certain states of iiroservatioii, the lateral ribs of the leaves beconio obsolete; 

 and in others the central disai)pears, in which state the resemblance to L. hinerve is 

 very close. 



