ANALYSIS OF GENERA. 
GEN. 3—47. 
SORI FURNISHED WITH AN INVOLUCRE. 
SoRI GLOEOSE. 
* Dorsal. 
At or near forking of vein (Cyatheae). 
On vein or in axil of forking of vein. 
Jnvol. globose covering sorus, bursting at top, and 
forming a cup. 4 Cyathea. 
Caudex arborescent, fr. aniple. 
On vein or veinlet. 
Jnvol. a scale, deciduous. 5. Hemitelia. 
Jnvol. globose, hard, bursting, irregularly at top. 
7 Diacalpe. 
On back or apex of vein (Dicksonieae). 
Of contracted frond, quite concealed by revo- 
lute margins of pinnae. 
Invol. delicate, membranous, half cup-shaped, ori- 
ginating from beneath sorus. 9 Onoclea. 
( Fronds dimorphous, herbaceous, large). 
Invol. soft membranous, cup-shaped or globose, 
bursting at top, margin fringed or irregularly 
lobed. 11 Woodsia. 
(Fronds small, herbaceous, much tufted.) 
Invol. globose, coriaceous, bursting vertically into 
two spreading lobes. 12 SPHiEROPTERis. 
* Jntraw.arginal. 
Invol. subglobose, cup-shaped, entire or two-valved. 
13 Dicksonia. 
(One half the species arborescent, with laige 
coriaceous decompound fronds : the other half 
with creeping rhizomes). 
