THE JURASSIC FLORA OF SUTHERLAND. 671 



A very similar, if not identical type, is figured by Heer from Jurassic rocks in the 

 Amur district as Asplenium spectabile* Specimens figured by Bartholin t and by 

 Moller | from Bornholm as C. nebbensis also agree closely with the Culgower fossil. 



Cladophlebis sp. cf. C. distans (Heer). (Photo. 16, PI. VII.) 



In this specimen the pinnules are very similar to those seen in fig. 30, PL II. , but 

 the lamina is slightly narrower and the veins are once forked as in C denticulata. 

 This specimen may be identical with Heer's Siberian Jurassic type Asplenium distans.^ 

 The same form is recorded also by Dawson || from the Lower Cretaceous of the Rocky 

 Mountains of Canada and by Schenk IT from Jurassic rocks in China as Asplenium 

 distans and A. argutulum Heer respectively. 



Cladophlebis sp. (PL III. fig. 47.) 



This imperfectly preserved distal portion of a frond or large pinna bears a fairly 

 close resemblance to the specimens which I have included in Coniopteris arguta, but 

 the evidence for describing it under that species is hardly sufficient. In the upper 

 branches of the rachis the lamina is crenulate, while in the lower pinnae the lobes of 

 the lamina are replaced by small pinnules. 



Rhizomopteris, Schimper. 



Rhizomopteris Gunni sp. nov. (PL II. fig. 40 ; PL III. figs. 41, 41 A.) 



Fig. 40, PL II., shows part of a trailing rhizome of a fern similar to that of Davallia, 

 Dipteris, and many other recent ferns. The portion of the specimen preserved as a solid 

 rod shows the stumps of three petioles, and, towards the lower surface, the small scars of 

 adventitious roots. The anatomical examination of this fragrant has been only partially 

 successful, owing to the imperfection of the preservation of the tissues and to the diffi- 

 culty of obtaining sections. The diagrammatic sketch of a transverse section (6x4 mm.) 

 reproduced in fig. 41, PL III., illustrates the general features. The greater part of the 

 section consists of thick-walled tissue composed of cells fairly uniform in size, A, B ; the 

 outer region, A, is clearly cortical (ground-tissue), bub the nature of the central region, 

 B, is less easy to determine. My first impression was that the axial tissue consisted of 

 xylem surrounded by a black band of partially disorganised phloem and pericycle, S. 

 More thorough examination, however, leads me to describe the axial tissue, B, as ground- 

 tissue enclosed by a ring of crushed and very imperfectly preserved vascular tissue, S. 

 I regard the rhizome as solenostelic : the stele, S, S, fig. 41 A, shows but little structure, 

 but here and there one sees a few large elements, which probably represent xylem 

 tracheids, and groups of small cells, presumably phloem or pericycle elements. The 

 appearance of the central tissue, B, is seen to correspond exactly with that of the patch 



* Heer (77), pi. xxi. t Bartholin (92), pi. vii. % Moller (02), pi. iii. 



§ Heer (77), pi. xix. || Dawson (85), pi. iii. IT Schenk (83), pi. xlvi. 



