JURASSIC FLORA OF DOUGLAS COUNTY, OREG. 123 



Ginkgo Huttoni (Sternberg) Heer." 

 PI. XXX, Figs. 8-12; PI. XXXI, Figs. 1-3. 



1833. Cyclopteris digitata Brongn. Lindley & Hutton: Foss. FI. Gt. Brit., Vol. I, 



p. 179, pi. Ixiv. 

 1833. Cyclopteris Huttoni Sternb.- Flora der Vorwelt, Vol. II, p. 66. 

 1836. Adiantites Huttoni (Sternb.) Gopp.: Syst. Fil Foss., p. 217. 

 1874. Ginkgo Huttoni (Sternb.) Heer: Regel's Gartenflora, Jahrg. XXIII, p. 261, 



pi. dcccvii, fig. 4. 

 1876. Ginkgo Huttoni (Sternb.) Herr: FI. Foss. Arct., Vol. IV, Pt. I (Beitr. z. Foss. 



Fl. Spitzbergens) , p. 43, pi. x, fig. 10. 

 1878. Salisburia Huttoni (Sternb.) Sap. : Plantes Juarassiques, Vol. Ill, p. 299, 



pi. clix [xxxi], figs. 4, 5; pi. clx [xxxii], fig. 8. 

 1900. Ginkgo digitata forma Huttoni (Sternb.) Sew. : Jur. Fl. Yorksh. Coast, p. 259, 



pi. ix, fig. 2. 



The forms which I group under the specific name Huttoni are the 

 most abundant next to those classed as G. sibirica. At some localities 

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

 is thick and firm. The leaves have as a rule four segments, which often 

 show no trace of subdivision. Occasionally one or more of the segments 

 may be divided by comparatively slight incisions, and more commonly 

 they rasbj 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 be truncate. When the segments are more than 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 No. 2 may be a new 



« Most authors include this form in G. digitata, which Lindley and Hutton helieved it to be, but Sternberg 

 separated it, redescribed it, and named it Cyclopteris Huttoni. Heer, however, 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 figures 

 a specimen from Scarborough in the British Museum, No. V, 3578. In the description of pi. ix, fig. 2, he does 

 not separate it from 6. digitata, but on page 259 he treats it as a form. After the arrival of his work in America 

 I called Professor Fontaine's attention to this, and in his letter of August 21, 1901, from which I have already 

 quoted extracts, says: "The Ginkgos 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. digitata. I think G. Huttoni 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. digitata." I there- 

 fore retain the species and confine the synonym}' to those names that refer to Lindley and Hutton's plant. — 

 L. F. W. 



fiFl. Foss. Arct., Vol. IV, Pt. I, p. 40, pi. x, fig. 10; Pt. II, pp. 59-60, pi. v, fig. lb: pi. vii, fig. 4; pi. x, fig. S. 



