FLORA OF rilF SHASTA FOUM A'I'IOX. 241 



sliows them, sceni soiiu^wIkiI dift'eronl tVoin those of the Potomnc [limits, 

 foi' they ^(1 otT inoi-e neai'lx' ;it ;i i-i<!;ht ;m,<!;le fr-oin the ini(h-ili iiiul are 

 mostly unhi'anehed. 



The piimules were evidently (|iiil(> long and narrow, as is shown in 

 the specimen fii veil in Fiij. o, which represents a frasiment of th(^ middle 

 portion of a pinnule. I'iii'. (i j»;ives the terminal poi'tion of a piniude, 

 which must have been lai'<^er than that I'epresented hy I'ln;. 5. Fig. 7 

 shows the lateral nervation. 



Tli<> midoubted s})ecimens of this plant are not very mimerous. They 

 occur at localities Xos. 0, 19, 20, and 22. The doubtful specimens are 

 numerous, and they occui- at localities Nos. 9, 14, 19, and 23. They are 

 mostly found at the last locality. 



A.\(;i(HTEun>u"M stkictinekvr eatifolitm Fi)iitaiiie. 

 1>1. LXVF Figs. S-10. 



1SS9. Aruilopter'ulivm strictinerrt latifolium Font.: Potomac Flora (Monogr. V. S. 



(it'ol. Surv,, Vol. XV), p. 116. pi. XXX, figs. 1, .5. 

 1S!I.") [isyti]. Aii(/i(ijit(ri(liuiii ncrromnii Font, in Stanton: Bull. I'. S. Cicol. Surv., 



No. i:>o, |). •_'■_>. (PI. LX\'l, Figs. II. 10.) 



A number of fragments of a fern were foiuid that appears to be 

 Anqioplcridium strict incrrc Idtifotiimi Font., of the Lower Potomac of 

 Virginia. The largest and best preserved of these fragments is repre- 

 sented in PI. LXVI, Fig. 8. This is a portion of a pinnule, prol)ably 

 its middle part. It shows .some of the midrib and of the lamina on one 

 side of the midrib. It must have been a pinnule at least 5 cm. wi(l(\ 

 There is no way -to estimate its length, or indeed that of any of the 

 pinnules, since they are found only as small fragments. The midril) is 

 quite strong. The lateral nerves are also strong and have the (>haracter 

 shown in the Potomac plant. 



This form occurs at localities Nos. Ifi, 19, and 23, and near Riddles, 

 Oreg. A consideral^le number of fragments of piiuiides are found at 

 No. 23, as well as fragments of pinnules of a smaller Angiopteridium, 

 which seems to be the typical .4. strictitiervc. 



This plant was formerly determined by me a.s .4. nervosum, and it 

 is (luoted as such by Dr. T. W. Stanton in Bulletin No. 133 of th(> ITnited 

 States Geological Sur\ey, page 22, but it proves, on further examination, 



MON \I.VIU — Or, 1(5 



