FLORA OF rUF SHASTA FOmiATlON. 271 



1() ihc liaso (if llic Chiro. \vvy few phiiits conic tVoiu llicni. 'Hie jilaiits 

 (lesci-il)O(l in tliis i);ii)ei-, oi- i-.-illicf the (lilTcfcnl spcciiiuMis, ascrihcd to 

 various genera and species, have very ditTerent values foi' throwing liglit 

 on the character of the flora. Some of the specimens can be positively 

 determined, otliei's are of veiy doul)tful charactei'. and their assignment 

 to this or that sjiecies or geiuis means simply that the specimen is more 

 like the form with wliich it is identilied than any otiici'. I will try to 

 indicate in the lists the degree of positiveness with which the detei'mina- 

 tion of a given plant, assigned to tliis oi' that horizon, has licen made." 



I'Umts itcciirriiii/ in tli( Sliiista nr LoWi r CniiicioUK halx. 



L In the Ktuixvillc oi' l()\\<'r iiicmhci- only: 



1. Dicksonia jiacliypliylla Font. n. s|). Only one doulitlul si)oeiincn. 



2. ThyrsDpteris rarineivis Font.^ Few and very doul)tl'ul Inigments. 

 :i (ladophlebi.s parva F'ont. Inipcrl'cct .specimens. 



4. ('iadophlel)is falcata Font. Numerous, and some fine specimens. 



."). Cladophlehis Ihigeri (Duidv.) Ward n. comb. Two very small Iragmeuts. 



6. Gleichenia Xordenskinldi Heer ( Doubtful specimens. 



7. Sagenopteris Mantelli (Dunk.) Schenk. Good specimens. 



5. Hausnumnia '. californica Font. n. sp. Only one very doubtful .sjiecinien. 

 <(. Cladophlebis alata Font.^ Doubtful specimens. 



10. F<|uisetum texense F'ont. '. Very doubtful specimen. 

 1 1. .Mlsonia Stantoni Font. n. sp. Fairly good specimen. 



12. Nilsonia californica Font. A single but very good specimen. 



13. Nilsonia!' sambucensis Ward n. sp. .\. few doubtful Iragments. 



14. Pterophylluni '. lowryanum Ward n. sp. One very doubtful specimen. 

 1.5. Zamites arcticus Giijip. Only one. but a distinct specimen. 



16. Cycadeospernum califoiiiicum Font. n. sp. A single but very distinct 

 specimen. 



17. Cephalotaxopsis ? rliytidodes Ward n. sp. Several specimens. 



18. Abietites? sp. Font, imnuitm-e cone. A single specimen of doubtful char- 

 acter. 



I'.t. I'roteu'phvlluni californicuni F'ont.n.sp. .\ single and doubtiul specimen. 

 20. .Vcacia'plivUuin pai-liyi)liylluni Font . n. sp. A single but distinct specimen. 



" The following four species arc not iiK-huii'd in ri-ofcssoi- Fonluinr's discussion. Imvinj;. cxcc-pt in one 

 case, IxMMi .sent to him since his report wa.s received: 



\. Gleichenia Gilbert-'nwmjmmi Font. n. sp. (sec p. 2.S2). It conies a|i|iaieinly from llie cxtrcna- np|icr 

 Horsetown hcds; perhaps from the base of the Chico. 



2. Dinonifes Buchidiiiix ranneriyix¥onl.l This was inchidcil in hisllrsl i-c))orl. from which the description 

 is taken, and the name piihlishcd hy Diller and Stanton. It is a small jjiece of a leaf on thc> same stone with 

 the immature cone of Ahietites, and was overlooked in the final report. It comes from the Kno.wille heds. 



'.i. Populiml Ricei Font. n. sp. This certainly comes from the Horsetown heds. 



4. !^apin(k>psis oregonen-ns I-'ont. n. sp. This is also from the Horsetown beds. — L. !•'. \\ 



