104 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



the pleasure of seeing, in the possession of Professor Bertrand 

 this summer, sections from another Rhytidolepis-Sigillaria in 

 which the structure was also preserved. Here there was the 

 closed primary xylem zone, surrounded by secondary exogenous 

 xylem; and had it not been for the preservation of the outer 

 surface of the specimen, which showed the fossil to be a Sigillaria, 

 I do not believe it would have been possible, from the study of 

 the vascular axis alone, to separate this specimen from that type 

 of structure which has usually been regarded as distinctive of 

 L epidodendron. l 



This may explain why Sigillarice showing structure appear to 

 be so rare in the Lancashire and Yorkshire beds, which have 

 yielded so much fine material for the study of the internal 

 organization of the Coal Flora. Sigillaria may not then be 

 so rare as generally supposed, for, in dealing with vascular axes 

 deprived of their bark, the chief, if not only, character by which 

 we could separate Sigillaria from Lepidodendron in the absence of 

 their fructification is lost. 



The fructification of Sigillaria will be considered under the 

 genus Sigillariostrobus, Schimper, as we are unable at present to 

 refer the cones to their parent stems. 2 



X. Sigillariostrobus, Schimper, 1870. 



1870. Sigillariostrobus, Schimper. Traite d. paleont. ve'ge't. ,Yo\. II., 

 p. 105. 



1 Rept. Brit. Assoc. Dover, 1899, p. 926. 1900. 



2 See also Renault, Cours d. betan. foss., 1881, p. 138; Renault, Struc- 

 ture comparee de quelques tiges de la Flore Carbonifere, p. 225. 1879. 

 (Theses pres. a la Faculte de Sciences d. Paris. ) Renault, Bassin Houiller 

 et Per mien d'Auiun el d'lZpinac. Flore foss. Deux, part, p. 184. 1896. 

 Grand 'Eury, Geologie tt Paleontologie du Bassin HouiUer du Gard, pp. 

 196-197, p. 238 et seq 1890. I wish to take this opportunity for correcting 

 an erroneous statement made in my second paper ' ' On the Fossil Flora of 

 the Yorkshire Coal Field " (Trans. Roy. Soe. Edin., Vol. XXXIX., Part 

 i., No. 5, 1897). On page 39 I say, quoting from Mods. Grand 'Eury, I.e., 

 p. 258 — "For me, in any case, there is not a doubt that the celebrated 

 silicified Sigillaria elegans from Autun, which is the Sigillaria Brardii 

 with the structure of a Dicotyledonous gymnosperm, has not been repro- 

 duced by spores." The not in italics should be deleted. 



