228 Systematic Paleontology 



Baieropsis pluripartita Fontaine, 1906, in Ward, Mon. U. S. Geol. Survey, 

 vol. xlviii, 1905, pp. 479, 481, 482, 505, pi. cvii, fig. 1. 



Baieropsis longifolia Fontaine, 1906, in Ward, Mon. U. S. Geol. Surv., vol. 

 xlviii, 1905, pp. 505, 517, pi. cxi, fig. 3. 



Acrostichopteris pluripartita Berry, 1910, Proc. U. S. Natl. Mus., vol. xxxviii, 

 p. 631. 



Description. — Pinnules large in size, inequilateral, fan shaped, sub- 

 opposite, at an acute angle of divergence, narrowly divided almost to the 

 base into three principal and a varying number of narrow linear sub- 

 ordinate segments. Venation of the usual character in this genus, slen- 

 der but distinct. The apices are usually, if not always broken off so 

 that their character cannot be made out. Eachis comparatively slender. 



This species includes certain indefinite fertile specimens upon which 

 Fontaine based the characters of the supposed fruits in his genus Baierop- 

 sis. This fructification is clearly to be correlated with Acrostichopteris 

 pluripartita, since one specimen shows a characteristic pinnule of this 

 species. The preservation is poor and the most that can be made out 

 are oval bodies apparently representing reduced or transformed seg- 

 ments of pinnules, all the segments of which are fertile in this case, 

 and not merely the basal ones as is shown in so many specimens of 

 Acrostichopteris longipennis. Fertile specimens of the present species 

 are, on the other hand, very rare and fragmentary. 



This species is present in both the Patuxent and Patapsco formations 

 of Maryland and Virginia. It is also recorded somewhat doubtfully 

 from both the Lakota and Fuson formations in the Black Hills rim of 

 Wyoming. In Portugal Saporta describes several very similar forms. 

 These include Sphenopteris cuneifida of the Urgonian-Aptian,^ Sphen- 

 opteris dissectiformis^ of the Aptian(?), Sphenopteris tenuifissa^ of 

 the Albian, and Sphenopteris fldbellina* also of the Albian. 



From the Neocomian sandstone near Quedlinburg in Saxony, Eichter ^ 



^ Saporta, Fl. Foss. Portugal, 1894, pp. 69, 127, pi. xvi, fig. 11, pi. xxiii, fig. 5. 



^Ihia., p. 68, pi. XV, fig. 18; pi. xvi, figs. 12, 13. 



^Ihid., p. 161, pi. xxviii, fig. 4. 



*IUd., p. 160, pi. xxix, fig. 16. 



"Richter, Zeits. deutsch. geol. Gesell., Band li, 1899, Verhandlungen, p. 40. 



