JURASSIC FLOHA OF DOrCJLAS COUNTY, OREG. 123 



(iiNK(i(> Ih TToxi (Stciiil)cr^) Ilccr." 



V\. X.XX, Fi.us. s r.': I'i. XXXI. Fijrs. 1-:^. 



1833. Ci/rlojitiris (lii/itiit<i liroii^ii. Liiullcy i<: lliittoii: Fo.s.s. Fl. Ct. Brit., \'ol. I, 



J). 1711. |)1. Ixiv. 

 1833. Cyclopliri.f /lulfdin Slcnil).- Flora dcr \'<ir\\cll, Vul. IF ji. (i(i. 

 1836. Ad'unil'itix Hiiltmii (Stcriil).) (icipp.: Svst. Fil Foss., p. I'lT. 

 1874. Giiik(ii> Iliittoiil (Stcnil).) Ileer: Jiogcl's (iartcnlloia, Jaiug. XXIII, p. L'lil, 



]il. ilccc\ii. lig. 4. 

 FS76. Giiibjo Ihtifoi,; (SUtdI).) FTcit: FI. Fo.s.s. Arct., Vol. TV. Pt. T ^Bcilr. ■/.. Foss. 



Fl. SpitzlxM'geiis), p. 43, j)l. x, lig. 10. 

 1S78. Sdli.sliiiriii lliiftoni (Stcrnh.) Sap.: Plaiitcs .luaras.si(|U('s, ^'ol. IH, p. L".)'.), 



pi. clix [\.\.\i]. ligs. 1. .") ; pi. cl.x [xx.xii], fig. S. 

 1900. Giiikgii (Ugitiita roriiia lliitfinii (Stornl).) Sew.: .Iiir. Fl. Yorksli. Coast, p. 259, 



pi. ix, fig. L'. 



Tlie fonns which 1 g;r()up uiulcr tlic spet'itic luinie Huttoni are the 

 most al)undant next to those classed as G. sihirica. At some locahties 

 the Huttoni form is more abundant than any otlier. The leaf substance 

 is thick and firm. The leaves have as a I'ule fovu' segments, which often 

 show no trace of sul^division. Occasionally one or more of the segments 

 may be divided by comparatively slight incisions, and more commonly 

 they may show a notching of the ends. The segments are very wide in 

 proportion to their length. They are widest above the middle of the 

 segment and generally narrow somewhat near the tip, which is rounded 

 off or may Ije truncate. When the segments are more tlian four, the 

 plant approaches the digitata type. Most of the leaves are larger than 

 those given by Heer.'' 



A very large leaf of this type that is found in a good many speci- 

 mens and is the most common Ginkgo at locality Xo. 2 may be a new 



"Most autliuis include this form m6.(ligiia(a,-w\m-h Lindlcy and Hutton believed it to be, but Sternberg 

 separated it, redeseribed it, and named it Cyclopteiis Hntlonl. Ileer, lunvever, retained it, as did also Saporta. 

 Mr. Seward, in his -Jurassic Flora of the Yorkshire Coast, reduces it to a mere form, of which he finds and lijjures 

 a specimen from .Scarboroufjh in the British Museum, No. V, 3.57.S. In the descripti(m of pi. ix, li;;. 2, he does 

 not separate it from (1. (HgUatn, but on page 259 he treats it as a form. .M'ter the arrival of his work in America 

 I called Profes.sor Fontaine's attention to this, and in his letter of Auf;ust 21, 1901, from which I have already 

 quoted extracts, says: "The (iinkgos gave me a good deal of trouble. There seemed to be no way of dealing 

 with them except as I did, or making them all G. d'ujitala. I think G. Iluttoni as good a species as can be made 

 out of such leaves. It is a common form, and very few specimens occur grading toward G. diffilala." I tlicre- 

 fore retain the species and confine tlie svnonvmv to those names that refer toLindlevand Mutton's plant. — 

 L. F. W. 



''FI.F0S.S. Arct., Vol. IV. I't. I,p. 10, pi. x.fig. 10: I't. II, pp. .-)9~l>(l. pi. v.lig. lb: pi. vii.lig. 1: pi. x, fig. ,S. 



