JURASSIC PLANTS PROM KAGA, HTDA, AND ECHIZEN. 35 



Fam. 3. Pecopterideae. 



7. Pecopteris Brgt. 



16. Pecopteris exilis Phitt. 

 PI. I, fig. 8-10, 9a. 



Frond tripinnated ; pinnae elongated ; secondary pinnae also 

 elongated, linear, opposite or alternate, a little directed forward; pin- 

 nules entire, oblong, obtuse, close together, free, but contiguous at 

 base in the upper pinnae ; median vein distinct, evanescent. 



Pecopteris exilis — Phillips, Geology of Yorkshire, p. 119, pi. VIII, 

 fig. 16. Bunbury, Quart. Journ. Geol. Soc. 1851, VII, p. 188, pi. 

 XIII, fig. 5 a. 56. Heer Beitr. zur Foss. Flora Spitzb. p. 29, pi. VI, 

 fig. 1, 16. Zigno, Flora Foss. Form. Oolith I, p. 141. Schimper, 

 Pal. A T égét. vol. I, p. 536. 



Pecopteris obtusifolia — Lindley and Hutton, Fossil Flora, vol. II T, 

 pi. 158. 



Pecopteris exiliformis — Geyler, Ueber foss. Pflanz a. d. Juraform, 

 Japans, p. 226, pi. XXX, fig. la. 



This species, first found in Yorkshire and afterwards in Spitzber- 

 gen, is also represented in the Japanese flora. Fig. 9 shows a speci- 

 men in which two primary pinnae are preserved. These pinnae pos- 

 sess long linear secondary ones which are often curved and provided 

 with alternate oblong obtuse pinnules, exactly agreeing with the 

 figure of Lindley. Pinnae of the second order measure 15-20 mm. in 

 length and 1-5 mm. in breadth; but they become much shorter 

 above where they appear crenate, owing to the contiguous state of 

 pinnules at their bases. The rhachises (fig. 9.) which are by no 

 means strong are slightly geniculate, especially in a pinna represent- 

 ed (3u the right-hand side of the figure : but I believe this to be no 

 permanent character of the plant. 



