1887.] PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 27 



50. Pseudopecopteris muricata (Brgt.) Lx. 



Warrior Creek, Jeffersou County, Ala. ; Frauk Burns, collector ; 

 three specimens; Museum numbers, 2204, 2206, 2208; lot number, 223. 

 Centerville, Tenn. ; Ira Sayles, collector; four specimens; Museum 

 numbers, 2207, 2218 ; lot number, 215. 



51. Pseudopecopteris Pluckenetii (Brgt.) Lx. 



Cannelton, Pa. ; received from I. C. Russell ; one specimen ; Museum 

 number, 2210 ; lot number, 227. 



52. Alethopteris ambigua Lx. 



Mazon Creek, 111. ; A. H. Wortheu, collector; one specimen; Museum 

 number, 2219 ; lot number, 69. 



53. Alethopteris lonchitica Sterub. sp. 



Warrior Creek, Jefferson County-, Ala.; Frank Burns, collector; three 

 specimens; Museum number, 2215; lot number, 223. Centerville, Tenn.; 

 Ira Sayles, collector; six specimens ; Museum number, 2216 ; lot num- 

 ber, 215. Cannelton, Pa. ; Received from I. C. Russell, one specimen ; 

 Museum number, 2222 ; lot number, 227. 



54. Alethopteris lonchitica, var. angustifolia Lx., n. v. 



Warrior Creek, Jefferson County, Ala.; Frank Burns, collector; one 

 specimen ; Museum number, 2217 ; lot number, 223. 



55. Alethopteris Serlii Brongn. 



Eugene, lud.; I Collett, collector; two specimens; Museum number, 

 2221 ; lot number, 71. 



56. Wood^ivardialatiloba Lx. 



Separation, Colo.; Mr. Levy, collector; one specimen; Museum num- 

 ber, 2391 ; lot number, 23. 



LYCOPODIACEiE. 



57. Lycopodites tenerrimus ? Heer. 



Upper Kanab Valley, Utah; C. D. Walcott, collector; two speci- 

 mens. 



The fragments are much like those figured and described by Heer, 

 Fl. Foss. Arct. IV., pt. 2 [Jura Fl. OstsibirJ p. 42, PI. XV., figs. 1^, 2-8. 

 Stem thin, filiform, fasciculate at base; dichotomous; branches erect, 

 filiform, bearing very small linear, short, or lanceolate longer, leaves 

 without nerves. Except that Heer says of the leaves that they are very 

 approximate, his description agrees with the plant. But from his figures 

 the leaves are as distant upon some stems and as large as upon the 

 specimens of the Museum. 



This plant is also much like Widdringtonites Beichii Heer, but the 

 leaves are larger and the base of the stem is without leaves and more 

 slender. Museum number, 2287 ; lot number, 8. 



