FLORA OF THE SHASTA FORMATION. 265 



Four specimcMis of a conifer that ajirees exactly with Spin tiolcpidiinu 

 Sfernbergianum (Dunk.) Heer were found at locality No. 17, which is 

 probably in the lower part of the Horsetown l)e(ls. 



The most complete specimen is that given in PI. LXIX, Fig. 7. 

 It repre.sents a small portion of a penultimate ))ranch, with a part of an 

 ultimate twig attached. The ultimate twig is pi-etty well [)reserved 

 and, with 1lir help of a lens, shows (luite distinctly the characteristic 

 leaves of *S. Stonhcrgianiim. It seems to have been rare. 



Class AX(;i()SPERlLF. 



Sul)class D I C () ^r ^■ L E D O N E S . 



Order SALICALES. 



Family SALICACE.E. 



Genus SALICIPHYLLUM Cnnwul/.." 



Salii IPHYLLUM PACHYPHYiJ.rii Fontaine n. sp. 



PI. LXIX, Fig. 8. 



A single specimen of a leaf resembling a Salix was found at locality 

 No. 23 in the same beds with the Menispermites described l)elow. The 

 specimen shows a nearl}^ entire leaf. It is of small size and broadly 

 elliptical in shape, narrowing gradually to the base and aj)ex. Tlio 

 midnerve is distinct and strong, but no other nerves are visil)le. The 

 texture of this seems to have l^een leathery and remarkably thick. It 

 is probably owing to this dense consistency that no subordinate nerva- 

 tion is shown. The plant seems to be a new species. In some points 



"It is necessary to credit this name — it can not be called a genus — to Conwentz. who, in ISSli, described it as 

 follows: "Novum genus omnia folia fossilia sali<'ibus recentibus siniillinui amplectens" (Die Flora des Bern- 

 steins, etc., von II. R. Gi'ii)pert und A. Mcugc, nach deren Iliuschcidcn sellistiindig bearlx'itcl ihmI fortgesetzt 

 von II. Conwentz, zweiter Band, Danzig, ISSG, p. -iS), and fidly treated one species, tS'. xiircincnniri Conw. 

 Three j'eai's later appeared Professor Fontaine's Potomac Flora, in wliirli, p. 302, lie describes Saliciphyllum as 

 a new genus. Although he gives it a delinite character as "leaves . . . elongate-elliptical in outline, with 

 midnervcs strong at base and much attenuated toward the summit: lateral nerves .slender, the primaries 

 going off very obliquely and curving strongly toward the summit of the leaf, continuing ap])roximalelv parallel 

 with the margin, but gradually approaching it;" still he says that "in the nervation, .so far as it could lie made 

 out, and in the shape of the leaves, they appear to be nearer Salix than any other genus," and it is evident that 

 his idea was practically the same as that of Conwentz, viz, to group together all t he leaves that closelv resembled 

 those of the living willows. If it were necessary to regard Fontaine's geiuis as distinct from that of Conwentz 

 it would also be necessary to rename it, and rather than do this it seems better to retain the name and credit it 

 to the author who first used it. — L. F. W. 



