56 UNITED STATES GEOLOGICAL SUEVEY— TERTIARY FLORA. 



LASTREA, Presl. 



Lastrca (Ooniopteris) Ooldiana, Lesqz. 



Plato IV, Fig. 13. 



Aajfidium Goldianum, Lesqx., Annnal Report, 1873, p. 393. 



Frond bi-tripinnatifid ; primary piDOSB broadly deltoid in outline ; secondary pinnie linear, 

 alternate, parallel, at an obtuse angle of divergence, alterpately and equally pinnately lobed ; lobes cut 

 to two-tbirds or tbree-fourths of tbeir lengtb, oblong-lanceolate, obtusely pointed, inclined outside; 

 middle nerve distinct; lateral veins five to seven pqire, curving inward, simple, parallel; borders slightly 

 crennlate by the impressions of the veins. 



The substance of this Fern is somewhat thick or subcoriaceous; the 

 secondary pinnae, apparently long and rapidly decreasing toward the point of" 

 the pinnae, are sessile, the inferior lower leaflet being free or not decurrent 

 along the rachis; the lobes are really entire as far as can be seen from the 

 recurved borders, and the crenulation is an appearance caused by the impres- 

 sion of the veins; the rachis, both of the primary and secondary pinnae, is 

 narrow, smooth. Its affinity is with a number of species of Cuba, like 

 Lastrea contermina, Desv., L. lonchodes, H. K., and especially L. scoloi)endro'ides, 

 Mett., var. pinnata. In the fossil species, its relation is with L. serrulala, 

 Heer, of the Boernstadt flora, differing widely, however, by the nearly entire 

 borders, and the lateral veins more numerous and at a more open angle of 

 divergence. 



To this species are apparently referable a number of fragments repre- 

 senting mere parts of pinnae, with pinnules slightly longer than those of fig. 

 13, but of the same form and with the same nervation. One of the specimens 

 has a small part of a fructified pinna, the leaflets bearing small round sori 

 attached upon the middle of the simple veinlets at equal distance of the 

 borders and the midrib, as in species of Goniopteris. 



Habitat. — Golden, Colorado. The fragments with fructifications have 

 been lately procured by Rev. A. Lakes. 



liastrea (Goniopteris) intermedia, Lesqx. 

 Plate IV, Fig. 14. 

 Atpidium {Laatrea) palcliellum ? or A. Fiacheri f, Lesqx., Annual Report, 1870, p. 384. 



Frond pinnate ; pinnae linear, oblique, alternate, connected by the decurrent base, pinnately 

 equally lobed; lobes divided to near the base, oblong, obtuse, oblique; lateral veins simple, curved 

 upward. 



The specimen represents part of an apparently large pinna; the divisions 

 are short, linear, one to two centimeters broad, rapidly narrowing toward the 

 top of the frond, parallel, at an acute angle of divergence, oO°, and decurring 



