CHARACTERS OF TRIBES AND GENERA. 369 



219. HELMINTHOSTACHTS, Kaulf. (1824). 



Fronds produced from a stout, short sarmentum, stipate 

 1 to l feet long ; sterile segments foliaceous, digitate, 

 pedate. Veins forked, free. Fertile spike rising from the 

 base of the leafy segment. Sporangia sub-globose, sessile, 

 in pedicellate crested whorls, opening vertically by a slit 

 on their exterior side. 



Type. Osmunda Zeylanica, Linn. 



Tllust. Hook, and Bauer Gen. Fil., t. 47 B. ; Moore Ind. 

 Fil. p. 100 A. ; J. Sm. Ferns, Brit, and For., fig. 156 ; 

 Hook. Syn. Fil., t. 9, fig. 74. 



Sp. H. Zeylanica, Hook. (H. dulcis, Kaulf.). 



OBS. First known as a native of Ceylon, and described 

 by Linna3us under the name of Osmunda Zeylanica, but is 

 now found in India, Eastern Australia, and New Caledonia. 



220. BOTRYCHIUM, Sw. (1800). 



Fronds erect, with dissimilar sterile and fertile segments. 

 Sterile segments foliaceous, deltoid, bi-tripinnatifidly de- 

 compound, rarely pinnate. Veins forked, free. Fertile 

 segment rachiform, compound, paniculate. Sporangia sub- 

 globose, free, coriaceous, opening vertically in two equal 

 valves. 



Type. Botrychium Lunaria, Sw. 



Illust. Hook, and Bauer Gen. Fil., t. 47 A. ; Moore Ind. 

 Fil., p. 99 B. ; J. Sm. Ferns, Brit, and For., fig. 157 ; 

 Hook. Syn. Fil., t. 9, fig. 75. 



Sp. B. simplex, Hitch, (v v.) ; B. lunaria, Sw. (v v.) ; 

 B. ternatum, Sw. ; B. lunarioides, Sw. (v v.) ; B. Virgini- 

 cum, Willd. (v v.). 



OBS. This is a very widely diffused genus, B. lunaria 

 being found in both the northern and southern temperate 

 B B 



