AN ENUMERATION OF CULTIVATED FERNS. 239 
bi-tripinnate, 5-15 feet long. Veins pinnate; venules free, 
simple. Receptacles punctiform, terminal. Sori globose, large, 
re flexed. Indusium bivalved, coriaceous ; the outer valve (acces- 
sary indusium) concave, cucullate, conniving with the smaller, 
usually less cucullate, inner valve or special indusium, forming 
an unequal valved cyst. 
1. D. arborescens, L’Herit.; Hook. Sp. Fil. t. 22 A D. 
auricoma, Spreng. Balantium auricomum, Kaulf. ; 
Presl. Dicksonia integra, Sw. Balantium arborescens. 
Hook. Gen. Fil. t. 30. — St. Helena. 
2. D. antarctica, Labill. Nov. Holl. t. 249. .Balantium 
antarcticum, Presl. Cibotium Billardieri, Kaulf . — 
Australia. 
3. D. Sellowiana, Hook. Sp. Fil. 1, t. 22 B. Balantium 
Sellowiana, Presl. — Tropical America. 
4. D. squarrosa, Sw. ; Scltk. Fil. t. 130. — New Zealand. 
5. D. lanata, Colenso ; Hook. Sp. Fil. t. 23 C. — New Zealand. 
128. CIBOTIUM, Katdf. 
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. 
Receptacles punctiform, terminal. Sori dentiform, reflexed. 
Indusium bivalved, horny, the outer valve ( accessory indusium) 
concave, cucullate, adnate to the margin ; the inner ( special 
indusium) smaller, and conniving with the outer, forming an 
unequal bivalved cyst. 
