AN ENUMERATION Of CULTIVATED FERNS. 249 



9. G. dichotoma, Hooh. ; Lowe's Ferns, 8, t. 21. Mertensia 



dichotoma, Willd. ; Schh. Fil. t. 148 ; Lang, et Fisch. 

 Ic. Fil. t. 29. Polypodium dichotomum, Thurib. Fl. 

 Jap. t. 37. Gleichenia Hermanni, B. Br. — General 

 throughout the Tropical and Subtropical regions of 

 the Southern Hemisphere. 



10. G. furcata, Spreng.; Lowe's New Ferns, t. 60. Acro- 



stichum furcatum, Linn. (Flum. Fil. t. 28). — West 

 Indies. 



11. G. pectinata, Fresl. Mertensia glaucescens, Willd. 



Gleichenia Hermann:", Sooh. et Grev. Ic. Fil. t. 14 

 (non B. Br.). — West Indies. 



12. G. pubescens, Kunth. Mertensia pubescens, H. B. K. 



Gleichenia immersa, Spreng. ; Hooh. et Grev. Ic. Fil 

 t. 15. — Tropical America. 



13. G. cryptocarpa, BZooh. Sp. Fil. 1, t. 6 .4. — Chili. 



14. G. Cunninghami, Sew.; Hooh. Sp.Fil. 1,1 6 2?; Hook. 



fil. Fl. New Zeal. C, t. 71.— Now Zealand. 



Sub-Ojjdek III.-HYMENOPHYLLACE.2E. 



Sporangia globose or oblate, furnished with a horizontal or 

 sub-oblique ring. Fronds thin, membranaceous, pellucid. Sori 

 marginal. Indusium an urceolate, sub-bivalved, extrorse, open 

 cyst. 



137. HYMENOPHYLLUM, Sm. 



Vernation uniserial and sarmentose. Fronds varying from 

 simple to decompound-multifid, membranaceous and pellucid, 

 smooth, or bearing simple, forked, or stellate hairs. Veins 

 simple or forked, free. Sori terminal. Indusium short, urce- 

 olate, bilabiate or bivalved. Beceptacle short, included withiD 

 the indusium. 



* Fronds glabrous. 



f Segments entire, plane or undulated. 

 Stipes and rachis rarely pilose. 



1. H. asplenioid.es, Sw.; Hooh. 1st Cent. Ferns, t. 56.— 

 Jamaica, Brazil. 



