168 MESOZOIC FLORAS OF UNITED STATES. 



Order GINKGOALES. 



Family GIXKGOACE.E. 

 Genus BAIERA Friediich Braun. 

 Baiera gracilis (Bean) Bunbiuy. 



PI. XLIV. Fig. 2. 



1S4.3. Schizopteris gracilis Bean in Morris: Cat. Brit. Foss.. p. 20 (from Bean's manu- 

 script). 



1S40. Baiera sp. Brongn.: Tableau, p. .38 (fide Bunbury: Quart. Journ. Geol. Soe. 

 London, Vol. VIL p. 182). 



18.5L Baiera gracilis (Bean) Bunbury: Quart. Journ. Geol. Soc. London. Vol. \'n, 

 p. 182, pi. xii, fig. .3. 



1865. Cycloptetis gracilis (Bean) Zign.: Osserv. sidle Felci Foss. dell'Oolite. p. 22. 



1878. Schizopteris digiiata 'Willn. [non (Brongn.) Gein.] in Saporta: Plantes Juras- 

 siques. Vol. Ill, pp. 277. 279. 



1902. Baiera gracilis (Bean) Bunb. Schrader: Bidl. Geol. Soc. Am.. Vol. XIIL 

 p. 24.5. 



In the collection made b}- Mr. Schrader there is a single specimen 

 that agrees exactly with Baiera gracilis (Bean) Bunb. It shows a por- 

 tion of a long petiole which bears at its summit two equal segments. 

 These divide dichotomously into several narrow laminse, which are 

 presers-ed for only a portion of their length. The .specimen shows espe- 

 cially a striking resemlilance to the figure of this Baiera given by Seward 

 in his Jurassic Flora of the Yorkshire Coast, pi. ix, fig. 5. It resembles 

 B. Muensteriana (Presl) Heer of the Rhetic formation, and Seward 

 points out the resemblance of some of the forms of B. gracilis to that 

 plant. 



Genus GIXKGODIL'il Yokoyama. 



GiNKGODiUM ? ALASKEXSE Fontaine. 



Pi. XLIV, Figs. 3, 4. 



1888. Baiera palmata Heer. Lesquereux: Proc. U. S. Nat. Mus., Vol. XI, p. 31, 

 pi. xvi. fig. 5. 



Two fragments of peculiar leaves occur in the collections, one in 

 the collection of Mr. Woolfe and one in that of Mr. Dumars. The speci- 

 men found by Mr. Woolfe was determined by Lesquereux as Baiera 



