THE FOSSIL OSMUNDACE.E. 479 



Osmundites sp. 



1889. Psaronius Huttonianus, Crie in Dames and Kayser, Palaeont. Abhandl, Neu Folge, 

 Bd. i., Heft 2, p. 11, pi. vii. (xv.) figs. 1-5. 



Professor Seward has called our attention to a description of a fossil stem under 

 the name of Psaronius Huttonianus. This species appears to be founded on a very 

 badly preserved specimen of Osmundites, the stem of which has almost entirely 

 disappeared. The only recognisable part of the plant is the coating of leaf-bases. 



Locality and Horizon. — " Im Suden von Neuseland in Trias-jura-schichten von 

 Toi-Toi und Mataura." 



DESCRIPTION OF THE FIGURES. 

 Osmundites spetsbergensis, Nathorst MS. 



Plate XL I. 



Fig. 1. Surface view of the specimen that contained the leaf-coating before the sections were cut; 

 natural size. 



Fig. 2. General view of a transverse section of the same. At a the outline of a stipular leaf-base is 

 distinctly seen : at R the zone of decurrent roots. x 5. (Slide 2320.) 



Fig. 3. General view of another transverse section of same specimen. R, the root zone ; s.s., solenostelic 

 fern rhizomes creeping in the disintegrated outer region. x 3. (Slide 2318.) 



Fig. 4. The smallest and innermost leaf-trace. The xylem strand is oval. x 50. (Slide 2320.) 



Fig. 5. A leaf-trace further out. The leaf-trace is curved, but the sclerotic strand in its concavity is 

 single. x50. (Slide 2318.) 



Fig. 6. A leaf-trace still further out. The sclerotic strand is divided into two masses. x 50. 

 (Slide 2320.) 



Fig. 7. One of the outermost traces. x 22. (Slide 2318.) 



Plate XLII. 



Fig. 8. A portion of a stipular leaf-base showing the sclerotic ring with the specialised lateral masses 



of sclerenchyma; scl'. x 15. (Slide 2319.) 



Fig. 9. Margin of the same sclerotic ring showing the contrast between the two types of sclerenchyma. 



x 90. (Slide 2319.) 



Fig. 10. Leaf-trace of a smaller petiole showing the type of the sclerenchyma in its concavity. x 10. 



(Slide 2324.) 



Fig. 11. The wing of the stipular leaf-base showing the continuous strand of sclerenchyma it contains. 



x 30. (Slide 2325.) 



Fig. 12. Transverse section of about one-half of the largest free petiole found in the peat-like material. 



x 22. (Slide 2326.) 



Figs. 13 and 14. Transverse sections of smaller petioles. x 22. (Slides 2327 and 2328.) 



Fig. 15. Transverse section of a small petiole with the ground tissue all sclerotic. x 50. (Slide 2331.) 



Fig. 16. Transverse section of a winged region of the rachis. x 22. (Slide 2322.) 



Figs. 17 and 18. Transverse sections of pinnae showing midribs and portions of the laminae, x 27. 



(Slides 232 1 and 2334.) 



Fig. 19. Transverse section of the lamina showing the structure of the mesophyll. x 100. (Slide 2333.) 



Fig. 20. Transverse section of the lamina showing the epidermis. x 100. (Slide 2333.) 



Fig. 21. Transverse section of the lamina showing the chloroplasts in the palisade tissue. x 225. 



(Slide 2331.) 



