JUEASSIC PLANTS FROM KAGA, HIDA, AND ECHIZEN. 59 



2. Ginkgo Thunb. 



39. Ginkgo digitata Brgt. 

 PI. XIII, fig. 2. 



Leaf semicircular, entire or with two to six lobes, petioled; pe- 

 tiole long, slender, canaliculated above; veins numerous, repeatedly 

 dichotomous, flabel lately divergent. 



Ginkgo digitata-Heer, Beitr. z. foss. Flora Spitzb., p. 40 pi. X, 

 fig. 1-6. Heer in Regel's Gartenflora, 1874, pi. 807. As G. digitata 

 integriuscula Heer, Beitr. z. foss. Flora Spitzb., p. 44, pi. X, fig. 7-9. 

 Beitr. z. Juraflora Ostsib. u. d. Amur]., 1878. p. 25, pi. VI, fig. 5, 

 6. Nachträge, p. 5. 



Baiera digitata-Schim^er^ Pal. Vegét., vol. I, p. 423. 



Cyclopteris digitata-Brgt., Végét. foss. I, p. 239, pi. 61, fig. 2, 3. 

 Zigno, Flora Foss. Form. Oolith., I, p. 102. 



A leaf of this species in an excellent state of preservation was 

 procured from Okamigö. It measures 30 mm. in length and 52 mm. 

 in breadth. It is fan-like in shape, and furnished with three compar- 

 atively shallow clefts on the top, one of which is nearly in the middle 

 of the leaf and attains the depth of one-third of its length. The other 

 two are on each side of the central one and are much nearer to it than 

 to the lateral margins of the leaf. They are about one-half as deep as 

 the central one. Veins are very distinct, all of them diverging from 

 the base of the leaf and ending in its upper extremity, after having 

 repeatedly forked on their way. 



The Japanese specimen, according to the descriptions of Heer, 

 must belong to his variety quadriloba (Foss. Flora Spitzb., p. Fl. X, 

 ßg. 3a), although the central incision is much shallower than in the 

 one figured by that author. 



Heer described in his contributions to the Spitzbergen and Sibe- 



