FI/^HA (W THE SHASTA FOHMATION'. 2o5 



Sagknoi'TKHIs oKF.coxEN'sis Foiilaiiu' lu comh. 

 PI. l.XV, Ki-rs. -W -AS. 



1804. Sa(renopien.'< Inlijolia Font, in Dillcr ^v^ Siaiiloii: Bull. (icoi. Soc. Am.. \<>\. \ . 



p. 4.-)(). (PI. LXV, Fi>;. :5s.) 

 1895 [1896]. Angiopteriiliuiii oirriom iifi l-'oiit . in Siunion: liiill. l". S. (icoi. Surv., 



No. 183, )). 22 (nonuMi.). (PI. F.W, Fijr.s. ;5(). ;;7.) 



Pinnules probably grouped in a digitate manner at the summit of 

 a principal stipe, number not known. Central pimuile l)roadly ellip- 

 tical, narrowing to the l)ase, ti cm. long, 'A cm. wide iti the widest poi- 

 tion, symmetrical and e(iuilateral in foi'in. Lal-f'i'nl pinnules inequi- 

 lateral and unsynimctrical, ol)long-elliplical, narrowing gi'adually to 

 the base, no nun. long, 22 mm. wide in the widest poi'tion. Botli kinds 

 of pinnules ar(^ probably sujiported on short stipes. The nervation 

 is fine and closely placed. The anastomosis is formed on the same 

 plan as in S. nervom, viz, by the junction of two adjacent nerves, or 

 bv the junction of a branch with an adjacent nerve soon after forking. 

 It is, however, more fre(ju(>nt than in S. nervosa. The midnerve in 

 all pinnules is very strong in their basal portions and splits up into 

 nerves l)efore reaching the middle portion. These latter, where the 

 midnerve is present, leave it at a small angle and proceetl to the margin 

 of the pinnule with a very slight outward curvature. The midnerve, 

 unlike that of S. ueriiosn, is flat, and it is pi'oportionally stronger in the 

 basal portion of the pinnul(\ although less woody in appearance. 



This plant differs from »S. nervosa in a numbei- of points. It is 

 smaller in size. The midnerve differs in the points previously men- 

 tioned. The lateral and secondary nerves are closer and finer, and 

 the>- anastomose more frec}uently. The foi'm of the pinnules in this 

 plant much resembles that of those of »S. Nilsoniaiia (Brongn.) Ward 

 {S. rhoifolia Presl) of the Rhetic formation, but the n<M'vati()n is closer 

 and finei', while the midnerve is not pi-olonged so fai' in tlie pinnule. 



\\'hile the number of features by which this plant differs fi-oin 

 S. nervosa is sufficient to justify its separation, provisionally, as a dis- 

 tinct species, still, as the amount of material is small, it is possible that 

 they may be the same, and in a larger number of specimens connecting 

 links might be found. 



