IG AUIANTUM. 



briato-serrate, young sterile ones obovate fimbriated, sori ro- 

 tiindate terminating a toothed or toothless lobe, stipes short 

 and the rooting rachis ebeneous glabrous. — Gardn. in Hook. 

 Ic. IHaui. vi. /. 503. 



Hab. Shady clefts of sandstone rocks near the city of Oeiras, Province 

 of Piauhy, Brazil, Gardner, n. 2391. Montagne de Mahiiri, Cayenne, 

 Le Prieur (in Herb. Hook.) — Very different as it appears at first sight 

 from A. dolahriforme, yet I must confess that recent investigation, and es- 

 pecially specimens lately received from Mr. Seeman of the latter, as 

 mentioned under A. dolahriforme, have shaken my confidence in this as a 

 species. Our figure above quoted is, however, a faitliful representation. 



31. A. delicatiiliwt, Mart.; " rhizoma very short simple, 

 fronds small slender pinnate, petiole and rachis filiform pa- 

 leaceo-pilose at the base, pinnic rather remote obovato-rhom- 

 boid equally cuneate at the base, upper margin rounded 

 incised and subulato-dentate, sori in the anterior margin so- 

 litary or two orbicular-oblong." Mart. Ic. Plant. Crypt. 

 Brasil. p. 93, t. 56, f. 2. 



Hab. On stones in warm shady places in the district of the river Japura, 

 Brazil, Martins. — It appears evident from Martius's well-executed figures, 

 that the young state of the frond only with a very small (and as represented) 

 solitary, imperfect sorus was seen : in this state we have exactly the young 

 substerile fronds of A. filiforme, Gardn. The plant has a very different 

 appearance when the fertile pinnffi and the rooting rachis appear, as shown 

 in Hook. Ic. Plant, f. 503. Martins compares his species with the little 

 known A. fuiniliim, Sw. 



32. A. rhizophytiim, Schrad. ; " rhizoma simple short, 

 fronds pinnate, petioles paleaceo-pubescent elongated and 

 rooting at the apex, pinnae glabrous subtriangular-flabelliform, 

 the posterior margin straight, interior shorter, anterior rounded 

 denticulate lobed and soriferous, lowermost ones wider and 

 semiorbicular, sorophorous lobules linear-oblong glabrous." 

 Mart. — Schrad. in Gott. Gel. Am. 1824. p. 872, n. 4. 

 Mart. Ic. PI. Crypt. Brasil. p. 92, t. 62. 



Hab. Shaded rocky places near the river Paraiba. Felisbert, between 

 Almada and Ferradas, Brazil, Martins. — I have not seen any species ex- 

 actly resembling this, which the learned Martins compares with A. rhizo- 

 phorum, Sw. It is, however, it must be confessed, very near to Gardner's 

 A. ealcareum; so that were the pinnce of this latter plant entire, instead of 

 deeply cut, and the sori longer, it would be identical with the present plant 

 of Schrader, a species I believe, though published in 1824, not taken up 

 by any author since, previous to Von Martins. 



§ III. Fronds hipinnate, of tenin the ijounger stale pinnate. (3.3 — ). 

 * Sori elongated, more or less continuous. (33 — 38 ) 



33. A. incisuin, Pr. ; fronds pinnate and lanceolate or 

 bipinnate and then triangular-lanceolate, terminal pinna 



