FBENS— SPHENOPTEEIDEiE— SPHENOPTEKIS. 35 



SPHENOPTERIDE^gi;. 



SPHENOPTEEIS Bronguiart, 1822, 



1822. Filicites-sect. Sphenopieris Bronguiart, Mem. mus. liist. iiat., vol. viii, p. 233. 

 1S2G. iS2)hw7iopteris Sternberg, Versucb, vol. i, tent., p. xv. 

 1828. Sphenopteris Brougniart, Prodrome, p. 28. 



Sphenopteris mixta Schimp. 

 PI. XI, Fig. 3; PI. XII, Figs. 1, 2; PI. XIII, Figs. 4, 5. 



1866. Sphenopteris rigida Brongn., Lesquereux, Eept. Geol. Surv. Illinois, vol. ii, iip. 



435, 469, pi. xxxix, figs. 5, 6 (excl. syn.). 

 1889. Sphenopteris rigida Miller, X. Amer. Geol. Pal., p. 143. 



1869. Sphenopteris {Cheilanthides) mixta Scliimper, Traite, vol. i, p. 382. 



1870. Sphenopteris mixta Schimp., Lesquereux, Eept. Geol. Surv. Illinois, vol. iv, p. 



409, pi. XXV, figs. 7, 8. 

 1879. Sphenopteris mixta Schimp., Lesquereux, Coal Flora, Atlas, p. 9, pi. liv, figs. 

 2 (1, 2,i); text, 1 (1880), p. 276. 



1883. Sphenopteris mixta Schimp., Lesquereux, 13th Eept. Geol. Surv. Indiana, pi. xv, 



figs. 1(2,3!). 

 1886. Sphenopteris mixta Schimp., Zeiller, Fl. foss. houill. Valenciennes, Atlas, pi. xii, 

 fig. 3; text (1888), p. 95. 



1889. Sphenopteris mixta Schimp., Kidston, Trans. Eoy. Soc. Edinb., vol. xxxv, 1, 



p. 405. 



1890. Sphenopteris mixta Schimp., Lesley, Diet. Foss. Pennsylvania, vol. iii., p. 987 



(text fig. "?). 



1870. Sphenopteris simiosa Lesquereux, Rept. Geol. Surv. Illinois, vol. iv, p. 409. 



1872. An Sphenopteris [Aneimioides) pulchra Marrat, Proc. Liverpool Geol. Soc, Feb- 

 ruary, 1872, p. 101, pi. viii, figs, la &! 



1884. Pseudopecopteris nummularia (Gutb.) Lesquereux, Coal Flora, vol. iii, p. 751, 



pi. ciii, figs. 1-3; 2d type in part (excl. syn.). 

 1893. Ovopteris mixta (Schimp.) Potonie, FI. Eothl. Thiiriugeu, p. 44. 



.Fronds tri- or polypiuiiate, spreading, extremely intricate and delicate; 

 rachis narrow, usually rounded below, sliallowly sulcate above, finel}" striate, 

 punctate by the attaclnnent of rather distant spines or spiny scales, flexuous, 

 sometimes slightly geniculate, and bordered in the smaller divisions by a 

 very narrow decurrent lamina ; primary (!) pinnae oval (!), obtuse, lax, flex- 

 uous ; secondary (?) pinnte alternate, very long, linear-lanceolate, very slen- 

 der, flexuous or slightly subgeniculate, open, generally at a right angle to 

 the primary (?) rachis, close or more often somewhat overlapping, hardly 

 contracted at the base, tapering from above the middle to a very slender. 



