FLORA OF TIIF SHASTA FORMATION. • 237 



SACiKNOPTEKlS XEKVOSA Fontaine n. s|). 



PI. FXV, Fi<,'s. 41 4.-). 



A iiuinher of fni^ment.s of detached piniiiile.s of a fei'ii witli anastomos- 

 iiiji iiei'Ncs which seems to !>(> a new sp(H'ies of Sajjentopteris were found at 

 several locahties. .Xoiie of the specnnens show the ])iimules entire, and 

 the nervation is not very distinct, hut by takinji imprints of dilYerent 

 pinnules, and ditTerent portions of these, a pretty jjood description can he 

 made out. This, however, owinji; to the imperfection of the material, can 

 not be regarded as certainly accurate. 



Pinnules very larg;e, probably grouped in a digitate manner at the 

 summit of a pi'incipal stipe. The central piimule is elliptical and sym- 

 metrical in form, narrowing gradually to the l)ase. It is at least 8 cm. long 

 and 3 cm. wide. The size of the other, or lateral pinnules, coidd not be 

 made out, but they appear to be somewhat smaller, inequilateral, and 

 unsymmetrical in form. The nerves are unusually strong and they are 

 rather remote. The midnei-ve is rounded and very strong in the middle 

 pinnule toward its base, and it ends in a short stipe. Toward the middle 

 of the pimnile it splits up into nerves. The nerves in the lower portion of 

 the pimiule go off very obliquely from the midnerve, and curve gradually- 

 away from it to the margin of the pinnule, forking repeatedly. In tlie 

 upper portion the branches into which the midnerve splits up by their 

 repeated forking fill the lamina of tlie pinnule. The anastomosis is most 

 commonly formed l)y a branch of a nerve joining an adjacent nerve, but 

 sometimes l)y two adjacent branches coalescing. 



PI. LXV, Fig. 41, represents the basal portion of a middle pinnule, 

 Fig. 42 the upper portion of a large pinnule, probably a middle one, and 

 Fig. 43 the tip of a lateral pinnul(\ Fig. 44 gives an enlargement of a 

 {)ortion of a pininik> to represent the character of the nerves. Fig. 45 

 represents the specimen from Riddles, Oreg. 



This plant occurs at localities Nos. IG and IS, in the California dis- 

 trict, and in the Horsetown beds near Kitldles, Oreg. At least a small 

 fragment was found there, showing the charactei-istic nervation. The 

 plant seems to ha\e been rather rare at ail the localities. 



