AN ENUMERATION OP CULTIVATED FERNS. 249 



9. Q-. dichotoma, Hook. ; Lowe's Ferns, 8, t. 21. Mertensia 



dichotomy Willd. ; Schk. Fil. t. 148 ; Lang, et Fisch. 

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

 Jap. t. 37. Gleichenia Hermann!, 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. (Plum. Fil. t. 28). West 

 Indies. 



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



Gleichenia Hermanni, Hook, et Grev. Ic. Fil. t. 14 

 (nonB. Br.).Wesi Indies. 



12. Gr. pubescens, Kuntli. Mertensia pubescens, H. B. K. 



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

 t. 15. Tropical America. 



13. Gr. cryptocarpa, Hook. Sp. Fil. 1, t. 6 A. Chili. 



14. G. Cunningham!, Hew. ; Hook. Sp. Fil. l,t.6B; Hook. 



fil. Fl. New Zeal. 6, t. 71. New Zealand. 



SUB-OKDEB IIL-HYMENOPHYLLACE.53. 



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, 8m. 



Vernation uniserial and sannentose. 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. Receptacle short, included within 

 the indusium. 



* Fronds glabrous. 



f Segments entire, plane or undulated. 

 Stipes and rachis rarely pilose. 



1. H. asplenioides, Sw.; Hook. 1st Cent. Ferns, t. 56. 

 Jamaica, Brazil. 



