JTRASSIC FLORA OF DOUGLAS COrXTV. OREG. (to 



a (.■umj)t)Uiul pinna. 1*1. \'I11, l"i<i;. lo, shows one of the pinna' cnlatged, 

 and Fig. 14 gives a poi-tion magnified two dianietoi's to show the iiorves. 

 PI. \'I11, I'ig. 1"), shows a small fiagmciit of a {x'mdtimalc pinna, witli 

 ullimat(~ pinna' to which ace altached fcflilc i)imnd(\s, which present their 

 upper siu'face uppermost ; hence the soi'i are di.sgui.sed. As is often the 

 case, thes(> fertile piimules differ somewhat from sterile ones that eome 

 fi'om similai' parts of the compouiul pinna. They are wider in proportion 

 to length and more obtu.se. PI. IX, Fig. 1, rejtresents a larger specimen, 

 having sterile piiuudes, from a position lowei' down on the compound 

 pinna than that shown in PL VIII, Fig. 12. I'liey aic undulate or dentate. 

 PI. IX, Fig. 2, shows an enlarged pinna. PI. IX, Fig. ."!, I'epresents a frag- 

 ment from a still lower position, carrying portions of ultimate pinnae and 

 sterile, serrately toothed pinnules. PI. IX, F'igs. 4 and 5, show magnified 

 pinnules of this. PI. IX, Fig. 6, gives terminal portions of ultimate pinnsp 

 that apparently correspond with the j)ai'ts represented in Fig. 3, but these 

 are narrowed by distortion from pressin-e, the margins being pressed into 

 the rock. If we suppose the parts represented in Figs. 3 and 6 to be com- 

 bined, we may get some idea of the expanse of this elegant fern. PL IX, 

 Fig. 7, gives a small fragment comparable to the portion shown in Fig. 3, 

 l)ut from a lower position on the compound piinia, where the pinnules, by 

 deeper incision, Ijegin to pass into ultimate pinnte. PL IX, Fig. 8, shows 

 one of these pinmdes enlarged. PL X, F^ig. 1, depicts a specimen of con- 

 siderable size, it being a portion of a peiudtimate pinna to which are 

 attached a consideral)le number of ultimate pinna^, carrying crenately 

 toothed fertile pinnules. Unfortunately most of these pinnules are con- 

 sideral)ly distorted, being narrowed by having their margins pressed down 

 into the rock. PL X, Fig. 2, represents the terminal parts of several ulti- 

 mate pinna' with fertile pinnules corresponding in position to the fragment 

 represented in Fig. 1, l)ut in this case they are not distorted. From these 

 the true form of those given in Fig. 1 may be determined. PL X, Fig. 3, 

 shows a single pinnule of this specimen enlarged to show the sori. PL X, 

 Fig. 4, shows a fine specimen. It is a fragment of a penultimate pinna 

 with ultimate pinnae, carrying fertile pinnules of the largest size. They 

 are more deeply incised than the pimiides shown in Fig. 1, and apparently 

 come from lower down on the compound pinna, where the piimules tend to 

 pass into ultimate pinna\ These fertile pinnules apparently correspond 



MO.N .\1.VHI — 05 5 



