solitary on the anterior side of the venules, attached sideways ; 

 oval, resupinate, sessile or very shortly pedicellate, having a 

 many-rayed apical ring. Veins foried, often repeatedly, from a 

 central costa ; venules free ; in the fertile spikelets pinnate, the 

 veinlets sporangiferous on the anterior side. 



Fronds branched, the rachis soandent ; branches usually conju- 

 gate, variously digitate- or pabnato-partite or pinnatifid, or pin- 

 nate, the pinnae sometimes articulated and deciduous. Rhizome 

 CEespitose or creeping. — A beautiful group of scandent ferns. 

 The name Lygodium, was first published by Swartz in Schrader's 

 Journal for 1800. Willdenow's name Hydroglossym, intended 

 for the same group, is always referred back to the Transactions 

 of the Erfurt Academy for 1802. It is, however, quoted by 

 Bernhardi in a paper coeval in date (1800) with the original text 

 of Swartz. Though it is, therefore, probable we have no means 

 of certifying the prior publication of WiUdenow's name, and 

 hence retain that of Swartz, which has obtained general accep- 

 tance, reserving that of WiUdenow, as Presl has done, for the 

 next genus, which includes one of WiUdenow's species. 



L. diehotomum, 8w, 

 L. japouicuiu, Sm, 

 L. venustum, Sw. 

 L. palmatmn, Sw. 



L. volubile, Sw. 



L. scandens, Sw. 



L. semibiplnnatum, "R.Br. 



L. articulatum, S-ich, and Lees. 



(b) Veins retioulafed. 



15 9 . HTDBO GLOSSTJM, WiUdenow, Act. Acad. Erford. 

 1802, 13 (reduct.); Fresl, Swpp. Tent. Pter. 112. 



LxGODlCTTON, J. Smith; Ltgodii sp., Aiiet. 



Fructifications forming compressed distichous spikelets, ex- 

 serted on the marginal teeth. Spore-cases included beneath ovate 

 eucuUate imbricated persistent soariose bractiform indusia, soli- 

 tary on the anterior side of the venules, attached sideways; 

 oval, resupinate, sessile or very shortly pedicellate, having a 

 many-rayed apical ring. Veins forked, from a central costa; 

 venules anastomosing in from two to four series of unequal 

 oblique-elongated hexagonal areoles. 



Fronds branched, the rachis scandent j branches conjugate, 



