AN ENUMERATION OP CULTIVATED FEKNS. 



239 



bi-tri pinnate, 5-15 feet long. Veins pinnate; venules free, 

 ■imple. liecepiaoles pcncliform, terminal. Sori globose, largf, 

 'eflexed. Indusium bivalved, coriaceous ; the outer valve {acces- 

 sory indusium) concave, cucullate, conniving with the smaller, 

 asually less cucullate, inner valve or special indusium, forming 

 an unequal valved cyst. 



1. D. arborescens, L'Serit. ; Sook. Sp. Fil. t. 22 A D. 



auricoma, Spreng. Balantium auricomum, Kaulf. ; 

 Presl. Dicksonia integra, Sw. Balantium arborescens, 

 Sook. Gen. Fil. ISO.— St. Helena. 



2. D. antarctica, Lahill. Nov. Soil. t. 249. Balantium 



antarcticum, Presl. Oibotium Billardieri, Kaulf. — 

 Australia. 



3. D. Sellowiana, Sook. Sp. Fil. 1, t. 22 B. Balantium 



Sellowiana, Presl. — Tropical America. 



4. D. squarrosa, Sw. ; Schk. Fil. t. 130. — New Zealand. 



5. D. lanata, Odlsnso ; Sook. Sp. Fil. t. 23 C— New Zealand. 



128. CIBOTIUM, Kaulf. 



Vernation fasciculate, decumbent, or erect and arborescent, 

 densely oriniferous. Fronds tripinnatifid, 5-15 feet long, gene- 

 rally glaucous beneath. Veins forked or pinnate ; venules free. 



Senus 128.— Portions of barren and fertile fronds, natural size. 



Receptacles punctiform, terminal. Sori dentiform, reflesed. 

 Indusium bivalved, horny, the outer valve (accessorij indusium) 

 concave, cucullate, adnate to the margin ; the inner (special 

 indusium) smaller, and conniving with the outer, forming an 

 unequal bivalved cyst. 



