778 MR R. KIDSTON AND MR D. T. UWYME-VAUGHAN ON 



Osmundaceas as directly descended from an ancestral stock from which at least two 

 other types of structure also arose — that of Botryopteris and that of Zygopteris. 



As far as can be gathered from Renault's meagre description of the fossil, it appears 

 to us that Grammatopteris Rigolotti, B. Ren. (14), possesses a type of structure that 

 may be regarded as primitively Osmundaceous. 



REFERENCES. 



1. Penhallow, " Osmundites Skideyatensis, n.sp.," Trans. Roy. Soc. of Canada, ser. 2, vol. viii., sec. iv., 

 p. 3, fig. 6, 1902. 



2. Pettko, "Tubicaulis von Ilia bei Schemnitz," Naturtvissensehaftliche Abhandiungen von W. Haidinger, 

 Bd. iii. p. 163, 1850. 



3. Unger, "Em fossiles Earnkraut aus der Ordnung Osnnmdaceen, etc.," Denkschriften der k. Acad, der 

 Wissensch. im Wein, Bd. vi. p. 137, 1854. 



4. Carruthers, "On the Structure of a Fern Stem from the Lower Eocene of Heme Bay, etc.," Quart. 

 Journ. Geol. Soc. Lond., vol. xxvi. p. 349, 1870. 



5. Penhallow, I.e., and also "Notes on Cretaceous and Tertiary Plants of Canada," in the same voIuiiih, 

 p. 31. 



6. Seward and Ford, " The Anatomy of Todea, etc.," Trans. Linn. Soc. Lond., ser. 2, vol. vi. p. 254, 

 1902. 



7. Zenetti, " Das Leitungssystem im Stamm von Osmunda regalis und dessen Uebergang in den 

 Blattsteil," Bot. Zeit., vol. liii. p. 53, 1895. 



8. Jeffrey, " The Structure and Development of the Stem in the Pteridophyta and Gymnosperms," Phil. 

 Trans. Roy. Soc. Lond., vol. exev. p. 127, 1902. 



9. Faull, "The Anatomy of the Osmundaceae," Botanical Gazette, vol. xxxii. p. 418, 1901. 



10. Boodle, "Further Observations on Schizaea," Annals of Botany, vol. xvii., No. 67, p. 513, 1903. 



11. Chandler, "On the Arrangement of the Vascular Strands in the 'Seedlings' of certain Lepto- 

 sporangiate Ferns," Annals of Botany, vol. xix., No. 75, p 406, 1905. 



12. De Bary, Comparative Anatomy, p. 280, Eng. ed. 



13. Lachmann, Contributions a I'histoire naturelle de la ranne des fougeres, p. 110, Lyons, 1889. 



14. Renault, "Note sur la famille des Botryopteridees," Bull. Soc. d' Hist. Nat. d'Autun, vol. iv. p. 362, 

 PI. X. figs. 11-12, 1891. Also Bassin houillier et Permien d'Autun et d'LJpinac, fasc. iv., "Flore fossile, 

 deuxieme partie," p. 46 (1896) ; Atlas, Plate XXX. figs. 9 and 10 ; Plate XXXI. figs. 1 and Ibis (1893). 



DESCRIPTION OF FIGURES. 



Figs. 1-2, 6-12, 14-18, and 20-24 are untouched photographs. Figs. 3-5, 13, 19, and 24-28 have been 

 made from lightly printed bromide prints, which were used as camera lucida tracings. 



The following lettering is used throughout : — xy., xylem strand ; pr.c, protoxylem ; ph., phloem ; prph., 

 protophloem ; S.T., sieve-tubes ; i.e., inner cortex; o.c., outer cortex ; />., pith ; /./., leaf-trace ; l.g., leaf-gap; 

 r., root. 



