FLORA OF THE SHASTA FORMATION. 229 



are small fragments of ultimate pinnse that have a few very characteristic 

 pinnules. This plant has such decided features that even small fragments 

 suffice to identify it. 



Cladophlebis alata Fontaine? 

 PL LXV, Figs. 17-21. 



18S9. CJadopMeUs alata Font. : Potomac Flora (Monogr. U. S. Geol. Surv., Vol. XV), 



p. 77, pi. xix, figs. 5, .5a. 

 1889. Pecofteris strictinervis Font.: Op. cit., p. 84, pi. xiii, figs. 6, 6a, 7, 7a, 8, 8a; 



pi. xix, figs. 9, 9a; pi. xx, figs. .3, 3a; pi. xxii, figs. 13, 13a; pi. clxx, figs. .5, 



.5a, 6, 6a. 

 1894. Cladophle'bis inclinata Font.? in DUler & Stanton: Bull. Geol. Soc. Ain., 



Vol. V, p. 4.50, quoad Cat. U. S. Nat. Mus., No. 3996. (PI. LXV, Fig. 21.) 

 1895 [18961. CladophleUs inclinata Font.? in Stanton: Bull. U. S. Geol. Surv., No. 



133, p. 15, quoad Cat. U. S. Nat. Mus., No. 3996. (PI. LXV, Fig. 21.) 



In the collections from the Shasta formation of California there are 

 many specimens that shoAV only small bits of ferns. They are small 

 fragments of the ultimate pinnse of ferns that have pinnules of small 

 size, of the type of Pecopteris or Cladophlebis. They are not found 

 attached to a rachis and are too imperfect to admit of positive determi- 

 nation. They clearl}^ belong to several different species. All that can be 

 done in these cases is to name the plants with which they show most affinity. 

 Larger and better specimens are required to describe or to identify them. 



Numerous specimens of a small fern were found that have much 

 resemblance to Cladophlebis alata Font. (Pecopteris strictinervis Font.)/' 

 of the Lower Potomac beds of Virginia. The fragments show only bits 

 of detached ultimate pinnse, carrying a few, and mostly imperfect, pinnules. 

 These can not be easily distinguished from those of P. strictinervis, but 

 where the material is so imperfect positive identification can not be made. 



PL LXV, Fig. 17, gives the termination of an ultimate pinna and 

 is the most perfect specimen found. Fig. 18 represents a small bit of 

 an ultimate pinna, with a few imperfect pinnules of the largest size seen. 

 Fig. 19 gives a fragment from a similar portion of the frond, with pinnules 

 of intermediate size. Fig. 20 represents the specimen formerly referred 

 with doubt to Pecopteris strictinervis. 



The plant occurs in numerous specimens at locality No. 22, and in 

 only one or two at localities Nos. 9, 18, and 19. 



a See pp. 158-160. 



