232 DIPTEROID FERNS [CH. xlv 



It will be clear from the descriptions given above that the living Dipteroid 

 derivatives cannot be placed naturally in any linear sequence. Each genus 

 appears to have evolved along its own line of advance from a common 

 source, which was probably not unlike certain Mesozoic genera, having 

 much in common with the living genus Dipteris. The living genera may be 

 arbitrarily seriated as follows: 



DIPTEROID DERIVATIVES 



I. Cheb'opleuria Presl, 1849 



II. Platycermm Desvaux, 1827 



III. Christopteris Copeland, 1905 



IV. Hymeiiolepis Kaulfuss, 1824 

 V. Neocheiropteris Christ, 1905 



VI. Pleopeltis Humb. & Bonpl., 18 10 



I species. 



14 species. 



6 (?) species. 



4 species, 



I species. 



90 species. 



The latter include those from Malaya alone. Van Rosenburgh. 



This list may very probably be added to, as the result of further investiga- 

 tion: and already it seems permissible to suggest that Phlebodiiini may be 

 held as a Dipteroid derivative. 



BIBLIOGRAPHY FOR CHAPTER XLV 



721. Mettenius. Fil. Hort. Lips. p. 26. 1856. 



722. HOFMEISTER. Higher Cryptogamia, p. 252. 1862. 



723. Hooker. Species Filicum, v, p. 272, PI. ccciv. 1864. 



724. Christ. Bull. Herb. Boiss. vi, p. 199. 1898. 



725. Bower. Studies on Spore-producing Members, iv, Phil. Trans. 192, p. 86. 1899. 



726. Seward & Dale. Dipteridinae. Phil. Trans. Vol. 194, p. 487. 1901. 



727. Giesenhagen. Niphobolus^ Fischer. Jena. 1901. 



728. Yapp. Lecanopteris^ k.r\r\.. oi^ox.. xvi, p. 185. 1902. 



729. DiELS. Engler and Prantl, i, 4, p. 199. 1902. 



730. Copeland. J. Perkins' Frag. Fl. Phil. p. 188. 1905. 



731. Van Rosenburgh. Malayan Ferns. Batavia. 1909. 



732. Christ. Geogr. d. Fame, PL 87. 1910. 



Til- Seward. Fossil Plants, 11, p. 380, where the Palaeontological literature is fully 

 quoted to date. 



734. Bower. Studies lU, V, VI, Ann. of Bot. 1913-1917. 



735. Von Straszewski. Platyceriuin^ Flora, Bd. 108, p. 304. 191 5. 



736. Copeland. Philipp. Journ. Botany, Xli. Nov. 1917. 



737. Halle. Arch. Bot. K. Svensk. Vetenkaps. Akad. Hand. Bd. 17. 192 1. 



738. H. H. Thomas. Proc. Camb. Phil. Soc. p. 109. 1922. 



739. Seward. Hooker Lecture, Linn. Journ. XLVi, p. 219. 1922. 



740. Von Goebel. Ann. Jard. Bot. Buit. xxxvi, p. 185. 1926. 



