97 ` CHARACTERS OF TRIBES AND GENERA. 
They are very widely distributed throughont the tropical 
and temperate regions of the earth, growing on the ground 
or in moist rocky places, but never epiphytal to my | 
knowledge. 
153.—Apranrum, Linn. (1737). 
Hook, Sp. Fil. 
Vernation fasciculate or uniserial, sarmentose, hypo- 
geous. Fronds simple reniform, pinnate or bi-tripin- | 
nate; pinns and pinnules articulate with the apex of the | 
petiole, often dimediate with an excentric oblique costs, 
in some evanescent. Veins unilateral or radiating, forked; — 
sterile venules free, the fertile combined in the margin, E 
forming sori as described above. 2 
Type. Adiantum cappillus-veneris, Linn, E 
Tust. Hook. and Bauer, Gen. Fil., t. 66, B; Moore Ind. ` 
Fil, p. 24; J. Sm. Ferns, Brit, and For., fig. 98; - 
Hook. Syn. Fil., t. 2, fig. 21. : 
Oss.— The following are examples of the principal spe- 3 
cies of the genus, of which above forty have come under E 
my notice in a living state. 
1.—Reniforme group. 
Fronds simple, reniform. 
Sp. A. reniforme, Linn. (v v.); A. asarifolium, Willd. ; 
A. Parishii, Hook. Fil. Ezot., t. 11. 
2.—Caudatum group. 
Fronds pinnate, pinne narrow. 
A. lunulatam, Burm, (v v.); A. rhizophorum, Sw. ; AY 
Edgworthii, Hook. ; A. caudatum, Linn. (v v.); A. sorbo- 
liferum, Wall.; A. deltoideum, Sw.; A. dolabriforme, 
Hook, (v v.). | 
