JURASSIC PLANTS PROM KAGA, TirDA. AND ECHIZEN. -< 



mentioned by myself as Dicksonia elongata in the Bulletin, shows a 

 fructification apparently resembling that of Cryptogramme B. Br. and 

 Onychium Kauf I. of the recent flora. The sori were probably linear, 

 placed on each side of the midrib as in Onychium. The involucrum 

 may possibly have been formed of the rolled-lip margin of the seg- 

 ment or pinnule as in Cryptogramme. The general appearance of the 

 fertile segments and the terminal nature of the sori remind us 

 strongly of the latter genus. 



Onychiopsis may provisionally be treated under Polypodiaceae, in 

 the neighbourhood of the tribe Pteridae, until the discovery of spo- 

 rangia points out its true systematic position among the ferns. 



8. Onychiopsis elongata Geyl. sp. 

 PI. II. tig. 1—3. PI. Ill, fig. 6 d. PI. XII, fig. 9,10. 



Frond slender, bi-tripinnated ; sterile pinnae alternate or rarely op- 

 posite, elongated, their length rapidly increasing towards the borer part of 

 the frond : pinnules alternate, acutely directed forward, lanceolate or 

 linearly -lanceolate, entire or lobed or even piiiuafelg parted : lobes or par- 

 titions acute at apex and acutely directed forward just l ihr the pinnules 

 themselves. Venation obsolete, secondary reins simple, each, going into a 

 lobe. Fertile pinnules elongated, irith a linear terminal sums on both sides 

 of the midrib. 



Thyrsoptens elongata — Geyler, Ueberfoss. Pflanzen a. d. Juraform. 

 Japans, p. 224, pi. XXX. fig. 5, XXVT, 4.5. Schenk in Richtho- 

 fens China, vol. IV, part X, p. 263, pi. LIV, fig. 1. 



Dicksonia elongata-Y okoyama, On the Jurassic Plants of Kaga, 

 Hida and Echizen (Bull. Geol. Soc. Japan, part B, vol. I, No. 1) p. (5. 



This plant seems to have been very slender and graceful in general 

 appearance, with twice to thrice pinnated fronds whose lightly bent 

 pinnae are in most cases set alternately along a slender rhachis (fig. 2, 



