122 iMESOZOlC FLORAS OF rNFrFD STATES. 



1874. Ginl-go digitata (Brongn.) Heer: Rcgel'.s (iaitenflmu. .laliirr. XXIII, p. 261, 



pi. dcccvii. fig.s. 1-4. 

 1874. Ginl-go integriuscula Heer: Kegel's Gartenfloia, -lahrg. XXIII, j). I'Ol, ])1. 



dcccvii, fig. 5. 

 1876. Ginl-go dig'ttnta (Brongn.) Heer: Fl. Foss. Arct.. Vol. TV. Pt. T (Bcitr. z. Foss. 



F'l. Spitzbergens), p. 40, pi. x, figs. 1, na h, (i. 

 1876. Ginkgo digitata biloba Heer: Op. cit., p. 41, pi. viii, figs, la, laa. 

 1876. Ginkgo digitata quadriloba Heer: Op. cit., p. 42, pi. x, figs. ;->», h. 

 1S76. Gitilgo digitata multiloha Heer: Op. cit., p. 42, pi. x, fig. 2. 

 1876. Ginkgo digitata angustiloia Heer: Op. cit., p. 43, pi. x, fig. 4. 

 1876. Ginl-go integriuscula Heer: Op. cit.. p. 44, ])1. x, figs. 7-9. 

 1878. Salishuria digitata (Brongn.) Saj).: Plantes Jura.ssiqiies. Vol. Ill, p. 294, pi. clx 



[xxxii], figs. 1-5. 

 1881. Ginkgo digitata integriuscula (Heer) Kollbrunncr: .Tahresb. d. Ostschweiz- 



Geogr.-Comm. Ges. in St. Gallen, 1880-1881, pp. 62, 77." 



I will place with this species those leaves that have the following 

 character, ignoring possible sporadic variation: 



Leaf substance thin; leaves small, with a wide spread, being wider 

 than long; segments numerous and not deeply incised, wide in proportion 

 to their length, closely placed and widest near or at their ends, so that 

 they have an ol:)Cuneate form; ends obtusely rounded, truncate, or 

 slightly notched. 



This type is represented in the Oregon Jurassic by a considerable 

 number of specimens, but not by so many as some other types. They 

 vary somewhat in size, but are all small in comparison with the forms of 

 the lepida and Huttoni type. This type tends to pass into the sibirica 

 type more than into any other. 



PL XXX, Fig. 1, gives a nearly entire medium-sized leaf, showing 

 a portion of its petiole. Two of the lo))es of this are shown slightly- 

 enlarged in Fig. 2. Fig. 3 shows a part of the summit of one of the leaves 

 having the most numerous segments. Fig. 4 represents a nearly entire 

 leaf of the largest size. This is shown slightly enlarged in Fig. 5. Figs. 

 6 and 7 give a part of a leaf having the widest segments seen. This 

 shows a portion of the petiole. 



The digitata type of Ginkgo is pretty wddely distributed in the Oregon 

 Jurassic. It is found at localities Nos. 2, 7, 14, and 19. 



" This may have been simply an enorof Kollbiunner's in failing to observe that Heergave thisform specific 

 rank. Bartholin in 1894 (Bot. Tidsk., Vol. XIX, pp. 9(), 97, 108, pi. iv [.xii], fig. 1 ), reduced it to a variety. — 

 L. F. W. 



