238 



METAXYOID FERNS 



CH. XLVI 



of the plural sori on the veins of Metaxya into the elongated sori of 

 Syngramme, and in the spread of those sori over the region between the 

 veins, as in ElapJioglossiim: and finally in the introduction of the mixed 

 sorus. All these advances are such as appear in other distinct phyla, such 

 as the Dipteroid Ferns. But as they occur here in Ferns which do not show, 

 as the latter do, the venatio anaxeti, the three genera may best be held as 

 a separate phyletic progression of Metaxyoid derivatives. Further enquiry 

 is needed to confirm or correct this view, while possibly other derivatives 

 maybe added later to the series. In particular, the relations to the G}'mno- 

 erammoid Ferns will have to be carefully considered. 



9i 



B 



Fig. 739. Elaphoglossitm latifoliitm (S\v.) J. Sm. a = vertical section of young lamina. b,c, show the 

 origin of young sporangia superficially. ^= transverse sections of sporangial stalks and hairs. f = tan- 

 gential section of a young soral area, showing the sporangia originating between the veins. ( x 75.) 



METAXYOID FERNS 



I. Sori following the course of the veins, 



Syngravime ] . Sv!\\\\\, 1845 

 11. Sori Acrostichoid. 



E/aphoglossum Schott, 1834: emend Christ, 1899 280 species. 



16 



;peci 



741- 

 742. 



743- 

 744- 

 745- 

 746. 



BIBLIOGRAPHY FOR CHAPTER XLVI 



J. Smith. Lond. Journ. Bot. Vol. 4. 1845. 



Hooker. Species Filicum, v, p. 152, Plate ccxcvii. 1864. 



Christ. Monographic des Genus ElapJioglossiim. Zurich. 1899. 



DiELS. Natiirl. Pflanzenfam. I, 4, pp. 256, 331. 1902. 



Schumann, Frau Eva. Die Acrosticheen, Flora, Bd. 108, p. 201. 1915. 



Bower. Studies VI, Ann. of Bot. xxxi, p. i, 1917. 



