70 
CATALOGUE OE FERNS. 
2-6 feet high. Veins simple or piimately forked, the exterior 
venule, or more, soriferous on their apices. Indusium columnar, 
reflexed, entire calyciform, or sub -bilabiate. 
1. S. punctilobum, J. r m. Nephr odium punctilobum, Michx. 
Aspidium punctilobum, Sw. Dicksonia punctiloba, HooJc. 
Dicksonia pubescens, Schk. Fil. t. 131. Dicksonia pilosi- 
uscula, Willd. Sitolobium pilosiusculum, F>esv. ; J. Sm. 
Gen. Fil. — North America. 
2. S. adiantoides, J. Sm. Dicksonia adiantoides, Hurnb. ; 
Hook. Sp. Fil. t. 26 B. Polypodium globuliferum, Flum. 
Fil. t. 30. — Tropical America. 
3. S. davallioides, J. Sm. Dicksonia davallioides, F. Br. — 
Australia. 
4. S. rubiginosum, J. Sm. Dicksonia rubiginosa, Kaulf. ; 
Hook. Sp. Fil. t. 27 A. — Tropical America. 
5. S. Moluccanum, J. Sm. Dicksonia Moluccanum, Blume. 
— Malay Archipelago. 
103. BALA1TIUM, Kaulf. 
(Dicksonise sp., HHerit. Culcita, Fresl.) 
Vernation fasciculate, decumbent, densely criniferous. Fronds 
deltoid, tripinnate, smooth ; ultimate segments dentate. Veins 
pinnate ; venules free, simple or forked. Sporangia terminal, in- 
cluded within transversely oblong, concave, bilabiate cysts, formed 
by the connivance of the special and accessory indusia, constitu- 
ting large, exserted, nearly globose sori, in thyrsiform clusters. 
1. B. Culcita, Kaulf. ; 1 ook. Gen. Fil. t. 60 A. Dicksonia 
Culcita, HHerit. Culcita macrocarpa, Fresl. — Madeira, 
Azores, and Tropical America. 
104. DICKSONIA, HHerit. 
Vernation fasciculate, erect, arborescent. Fronds bi-tripinnate, 
5-15 feet long. Veins pinnate ; venules free, simple. Accessory 
indusium concave, cucullate, larger than the special indusium, 
