236 FLORA OF LOWER COAL MEASURES OF MISSOURI. 



striae intersecting at the obscure scars. Likewise the Sigillaria Grand ^JEuryi 

 of Lesqnereux/ which Avas sejDarated from S. cam/ptotcenia on account of the 

 close leaf scars and the smooth cortex, is perhaps of doubtful specific value. 

 The type specimen, which is comparable to fig. 8 (Pseudosigillaria dhnorplia) 

 on pi. ix of Grand 'Eury's admii'able work on the flora of the basin of Gard, 

 is certainly extremely closely related. The leaf scars are close and obscure, 

 the cortex being partly removed or wholly wanting in portions of the frag- 

 ment. The fact that it is found, at Cannelton, Pennsylvania, where S. camp- 

 totccnia is present in great numbers, necessitates great caution in discussing 

 its specific individuality. 



After examining all the material at my disposal I am convinced that 

 the roots or rhizomes described as SigiUarioides stellaris' and later referred 

 by Lesquereux to Stigmaria'^ belong to the subterranean or subaqueous 

 portions of SigiUaria camptotcenia. 



Although Sigillaria camptotcBnia is now known in most of the coal fields 

 of Europe, there still remain some differences of opinion as to the identity 

 of Dr. Wood's tree with that described by Goldenberg as Sigillaria rimosa. 

 Thus, while Zeiller,* Grand 'Eury,^ and Weiss" express their assurance that 

 the two species are identical, in which view Potonie'^ and Kidston* concur, 

 Lesquereux and Nathorst'' have questioned the proprietj^ of the union. It 

 is true that the quite distinct separation of the lateral cicatricules, which 

 constituted the principal difference, in the judgment of Professor Lesquereux, 

 between S. rimosa Gold, (non Sauv.) and S. monostigma Lx., have been shown 

 to be due to error, since the cicatricules of the original type of fig. 1 on 

 pi. vi of the Flora Sarsepontana Fossilis has been shown by Weiss and 

 Nathorst, each of whom has refigured a part of the original, to agree, pei'- 

 liaps indistinguishably, with those of specimens whose identity with our 

 species is indubitable. The extreme obliquity of the interfoliar cortical 

 strias in Goldenberg's figure, which, as Nathorst points out, do not pass so 



' Coal Flora, vol. iii, p. 795. 



•Eept. Geol. Surv. Illinois, vol. iv, 1870, p. 450, pi. xxix, fig. 3. 



^Coal Flora, vol. ii, p. 516, pi. Issiv, fig. 7. 



■iFl. foss. bassin houill. Valenciennes^ 18S8, p. 590. 



f'G(1ol. et piiloout. bassin liouill. Card, 1890, p. 261. 



eSigillarieu d. Vi. Steink. u. Rothl., pt. 2, 1893 (1894), p. 68. 



"Jalirb. d. k. Pr. geol. Landesanst. u. Bergakad , 1893 (1894), p. 35. 



8Trans. Roy. Soc. Edinb., vol. sxxvi, pt. 1, 1891, p. 16. 



"Zur pal.-iozoiscbeu ^lora der Polarllinder, 1894, p. 64. 



