55. AUTROPHTtrsL 393 



S. A. immersum, Mett. MSS. ifr. 2-4 in. 1., ^ in. br., narrowed gradually to an 

 acute point and at the base to a short stem ; texture thick ; no distinct midrib; 

 central areolce vertical, long and narrow ; vmns distinctly raised on the upper 

 surface ; sori quite immersed, often forked. — Hemionitis, Hory. A. pumiliim, 

 Kaulf. Hh. 4- Grev. Ic. t. 46. Bt. Sp. 5. p. 170. 



Hab. Maniitiua, Bourbon, Malaya. 



4. A. coriaceum. Wall. ; fr. 6-8 in. 1., ^ in. br., narrowed very gradually 

 from the centre to the base and an acute point ; texture very thick ; no midrib; 

 the areolm very long and narrow, very distinctly raised on the upper surface ; the 

 sori quite immersed, sometimes confluent. — Hh. Sp. 5. p. 163. 



Hab. Himalayas, the Philippine and Malayan Islea. — A . nanum, Ffe, is as coriaceons in 

 textnre, but not so plicate. In our specimens the fronds are oblong-spathnlate, and only 

 1 in. 1., so that it is very donbtfal whether the plant be not an undeveloped condition of 

 some of the other species. 



5. A. plantOffiTieum, Kaulf. ; Jr. 6-9 in. I., 1^-2 in. br., broadest one-tliird of 

 the way down, the point acute, the lower part narrowed gradually into a stem 

 1-4 in. 1. ; no midrib; areolae 1-3 in. 1., J in. br. ; the sori copious, deeply 

 immersed, often uniting. — /3, A. angustatum. Brack. ; texture thinner ; fr. ligu- 

 late, 1 ft. 1., I in. br. ; st. 6 in. 1. — Hk. Sp. 5. p. 170. A. Lessoni, Bory. Hi. 

 Sp. 5. p. 170. 



Hab. Ceylon, Himalayas, and Malay ; Philippine and Polynesian Isles. — A. parmdum, 

 BInme, looks like a small narrow-fronded form of this. 



6. A. Oumingii, Fee ; fr. 18 in. ]., 1-1^ in. br., ligulate, about equal in width 

 in the central half, narrowed very gradually to the base and an acute point, 

 with a black midrib in the lower quarter, the central areol(B several inches long 

 and not more than \ lin. br. ; sori very slender, deep-sunk, often joining, the 

 edge of the furrow rather raised. — Hk. Sp. 5. p. 167. 



Hab. Philippines, Ouming, 416. — ^According to Mettenins, this is a variety of the 

 Alalayan A. calUsfolivm,, Blume, and differs from the next by its narrower longer 

 rhizome-scalea, and softer fronds narrowed gradnally to the base. 



7. A. reticulatum, Kaulf. ; fr. 6-15 in. 1., 1^2 in. br., broadest about one- 

 'ihird of the way down, the point blunt or acute, the lower part narrowed very 

 gradually to the base or a short compressed stem ; midrib scarcely any ; areolce 

 several in. 1., 1-1 J lin. br., very distinctly raised on the upper surface; sori 

 .copious, often joining, raised above the surface. — Hlc. Sp. 6. p. 169. 



Hab. Himalayas, Ceylon, and Malaccas to Aneitenm and Queensland. 



8. A. semicostalum, Blume ; fr. 6-18 in. 1., 2-4 in. br., broadest about one- 

 third of the way down, nan-owed to an acute point and very gradually to the 



"base or a short stem, the edge entire, with a distinct blackish mz^rii in the lower 

 half, the central areolce often 2-3 in. 1., ^ in. br. ; sori copious, often joining, 

 rising above the surface. — H. Sp. 5. p. 168. A. latipes, Kunze. 



Hab. Ceylon, Malaccas, Philippines, and Polynesian Isles. — Species 2 to 8 come very 

 near to one another, and cannot be regarded as clearly distinct. 



** Sori superficial or but slightly immersed. Sp. 9-16. 



9. A. ensiforme, Hk. ; jfr. 6-12 in. 1., |-| in. br., ligulate, the point acute, the 

 edge entire, the lower part narrowed very gradually from halfway down to the 

 base ; midrib broad, obscure, lost upwards ; veins sunk, forming 3-4 rows of 

 irregular hexagonal areolee between the midrib and edge ; swri raised above the 



3d 



