AN E&UMEHWrON 0$ CULTIVATED fERNS. 125 



50. GYMNO GRAMMA, Desv. 



Vernation fasciculate, erect. Fronds pinnate, bipinnatifiJ, 

 or multifid, rarely simple, smooth, villose, or farinose, from a 



Genus 50.— Portion of mature frond, upper side. No. 1. 



few inches to 2-3 feet high. Veins forked ; venules free. Re- 

 ceptacles medial, elongated. Sori linear, simple, or forked, often 

 becoming confluent, naked. 



§ 1. Neurogramma. Fronds pinnate or bipinnate, villose. 



1. G. rufa, Desv. ; Lowe's Ferns, 1, t. 6 A. Hemonitis rufa, 



Sw. ; Schk. Fil. tt. 17, 21.— Tropical America. 



2. G. tomentosa, Desv. ; Lowe's Ferns, 1, t. 6 B ; Booh. Fil. 



Exot. t. 13. Hemionitis tomentosa, Badd. Fil. Bras, 

 t. 19. — Tropical America. 



§ 2. Trismeria. Fronds pinnate ; pinnce bi-trifoliate ; seg- 

 ments linear, covered with white or yellow farina. 



3. G. trifoliata, Desv. ; Hook. Gard. Ferns, t. 4; Lowe's New 



Ferns, i. 31. Acrostichum trifoliatum, Linn. ; [Plum. 

 Fil. t. 14-4 ;) Schk. Fil. tt. 3 et 22. Trismeria argentea 

 et aurea, Fee, Gen. Fil. t. 14 A.— "West Indies and 

 Tropical America. 



§ 3. Ceropteris. Fronds bi-tripinnatifid or multifid, covered 

 with waxy farina on the under side. 



4. G. Calomelanos, Kaulf; Hook. Gen. Fil. t. 37; Hook. Gard. 



Ferns, t. CO. Acrostichum Calomelanos, Linn.; Plum. 

 Fil. t. 40 ; Schk. Fil. t. 5; Lang, et Fisch. Ic. Fil. i. 3 — 

 Tropical America. 



5. G. Tartarea, Desv. Acrostichum Tartareum, Sie. — Tropical 



America. 



