100 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



In the Rhytidolepis Sigillarice branching appears to be ex- 

 tremely rare, and the only specimen of this section which I have 

 seen exhibiting a dichotomized stem was an example of Sigillaria 

 tessellata found by Mr. George Wild at JBardsley Colliery in a 

 bed of shale, about 50 feet below the " New Mine." l 



In the scarcely separable Favularia Section three figured 

 specimens showing a bifurcation recall themselves — two of 

 Sigillaria elegans" and one of Sigillaria JEugenii, Stur. 3 



The Clathraria Sigillaria also branched, but apparently very 

 sparingly. Renault gives a figure of Sigillaria Brardii showing 

 a dichotomy. 4 Possibly the Sigillaria Brardii figured by 

 Germar, 5 and re-figured by Weiss and Sterzel, 6 may be also a 

 portion of a bifurcated example. 



Examples showing the foliage attached to the stem, though 

 rare, are occasionally met with. In some the leaves are narrow 

 lanceolate, as on Sigillaria discophora, Konig sp., and on others 

 long and grass-like, as on Sigillaria camptotcenia, Wood sp. 



The leaves appear to have been articulated, otherwise how can 

 one explain the occurrence of the clearly-defined leaf-scar which 

 is almost universally met with throughout the genus, the only 

 exception being perhaps Sigillaria discophora and Sigillaria 

 Taylori, where the leaf seems to have remained long attached to 

 the stem and eventually withered off, as clearly-defined leaf-scars 

 are all but unknown in the case of these two species. 



Some species of Sigillaria had Stigmaria as their rhizomes. 

 This was the form attached to some Rhytidolepis trunks. It is 



1 Wild, "Ona Section of Shaft sunk through the Middle Coal Measures 

 at Bardsley Colliery, and an interesting discovery of Calamites," Man- 

 chester Geol. Soc, Feb. 2, 1886. 



2 Roehl, Foss. Flora d. Steinkohlen Form. Westphaltns, PI. XXVIII., fig. 

 17, 1869; Achepohl, Das Nitderrheinsch- Westfalisehe Suinkohlen-Gebirge., 

 PI. IX., fig. 20, 1880. The bifurcated specimen figured by Potonie — Lehr- 

 buchd. Pjianzenpalceontologie, 1899, PI. III., fig. 1, " Favularischer- Sigillaria- 

 Gabelzweig" — is probably referable to Sigillaria elegans. 



3 Stur, Culm Flora, Heft. II., PI. XXV., figs. 2-3. 1877. 



4 Bassin houil. tt perm. d'Autun tt d'Epinac. Flort foss. Deux part, 

 1893, PI. XXXV. 



5 Vers. d. Steink. v. Wettin u. Lobejun, fasc. III. , PI. XI. 



6 Die Sigillarien d. preuss. Steink. -u. Rothl. Gebiete II. Die Gruppe der 

 Subsigillarien, PI. XV., fig. 61. 1893. 



