AN ENUMERATION OP CULTIVATED FEENS. 



239 



bi-tripinnate, 5-16 feet long. Veins pinnate; venules free, 

 simple. Receptacles punctiform, terminal. Sori globose, large, 

 reflexed. Indiusmm bivalved, coriaceous ; the outer valve (acces- 

 sory indusium) concave, cuouUate, conniving with tbe smaller, 

 usually less cucuUate, inner valve or special indusium, forming 

 an unequal valved cyst. 



1. D. arborescens, L'Herit ; HooTc. Sp. Fil. t 22 A T>. 



auricoma, Spreng. Balantium auricomum, Kavlf. ; 

 Presl. Dicksonia Integra, Svi. Balantium arborescens. 

 Hook. Gen. Fill 30.— St. Helena. 



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



antarcticum, Presl. Cibotium Billardieri, Kcmlf. — 

 Australia. 



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



SeUowiana, Presl. — Tropical America. 



4. D. squarrosa, 8w. ; Schh. Fil. t. 130. — New Zealand. 



'5. D. lauata, Colenso ; Hooh. 8p. Fil. t. 23 C. — New Zealand. 



128. CIBOTIUM, EaiiJf. 



Vernation fasciculate, decumbent, or erect and arborescent, 

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

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



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



' Bfsceptacles punctiform, terminal. Sori dentifoi'm, reflexed; 

 Indusivm, bivalved, horny, the outer valve (accessory indtisium) 

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

 indMsiwm) smaller, and conniving with the outer, forming aa 

 unequal bivalved cyst. 



