38. ASPLENIUM, EUASPLEffrtJM. 203 



naked ; fr. 12-18 in. 1., 4-6 in. br., with 12-20 stalked horizontal pinnae on 

 each side, which are 2-3 in. 1., -f in. br., the point acute, the edge slightly 

 undulato-crenate, the upper side with a distinct auricle at the base, and then 

 narrowed suddenly, the lower side obliquely truncate ; texture thinly herbaceous ; 

 colour deep-green ; rachis naked, green, compressed, flaccid ; veins fine, distant, 

 usually once forked ; sori distant, in 2 regular rows, falling short of the edge. 

 -A. riparium, Liebm. Hk. Sp. 3. p. 119. t. 169. 



Hab. Tropical America, from Mexico and the West Indies to S. Brazil. A. dbtusi- 

 folium, L., appears to be founded on a dwarfed form of this, with blunt and somewhat 

 laciniated pinnas. 



67. A. fuliginosum, Hk. ; st. tufted, very short, densely clothed with blackish 

 fibrillose scales ; fr. 6-12 in. 1., 2-3 in. br., with 1 2-24 broadly-adnate horizontal 

 subfalcate pinnae on each side, which are 1-1^ in. L, - in. br., the point acute, 

 the edge slightly toothed, the base a little narrowed on both sides in the lower 

 ones, which are gradually reduced in size downwards ; texture papyraceo- 

 herbaceous ; colour nearly black when dry ; rachis densely fibrillose throughout ; 

 veins usually once forked ; sori in 2 regular rows near the point of the pinnae. 

 Hk. Sp. a p. 120. 2nd Cent. F. t. 3. 



Hab. Borneo ; gathered by Mr. Low. A very well-marked plant. 



68. A. JBorneense, Hk. ; st. 3-4 in. 1., stout, greyish, arcuate, fibrillose ; fr. 

 3 ft. 1., 2| in. br., with very numerous sessile pinnae, the lower ones growing 

 smaller very gradually, the central ones 1 J in. 1., J in. deep, the point bluntly 

 rounded, the upper edge inciso-lobate, auricled inwards, and narrowed suddenly 

 at the base, the rest and the outer part of the lower edge, which is very 

 obliquely truncated at the base, distantly toothed ; texture herbaceous ; rachis^ 

 firm, nearly naked ; veins subflabellate in the outer half of the pinnse ; sori 

 few, almost in parallel rows. Hk. Sp. 3. p. 135. t. 186. 



Hab. Borneo, H. Low, Jr. This comes near A. cultrifolium, but is a stronger plant, 

 with blunter and more unequal-sided pinnae dwindling downwards very gradually. 



69. A.Jlrmum, Kunze ; st. tufted, 4-8 in. 1., firm, erect, greyish, naked ; fr. 

 6-12 in. 1., 3-4 in. br., sometimes proliferous at the apex, with 12-20 sessile 

 horizontal pinnae on each side, which are 1^-2 in. 1., |-f in. br., the point 

 bluntish, the edge inciso-crenate, the upper one narrowed suddenly at the base, 

 the lower one obliquely truncate ; texture herbaceous ; rachis firm, naked, slightly 

 winged ; veins distant, once forked ; sori short, in 2 regular rows, falling short 

 of both midrib and edge. Hk. Sp. 3. p. 134. t. 174. A. abscissum, Auct. 



Hab. Tropical America, from Cuba and Guatemala to Peru and S. Brazil. Very 

 doubtfully distinct from A. cultrifolium, from which it differs mainly by its shorter and 

 blunter pinnse. 



70. A. cultrifolium, Linn. ; st. 4-6 in. 1., naked, greyish, firm ; fr. 6-12 in, 1., 

 4-6 in. br., deltoid-ovate, with a lobed terminal point and 6-10 pinnce on each 

 side, which are 3-4 in. 1., ^-f in. br., the point acute, the edge broadly toothed, 

 sometimes lobed below nearly or quite to the rachis, the base nearly at a right 

 angle on the upper, but obliquely truncate on the lower side ; texture herba- 

 ceous ; veins fine, distant, usually once forked ; sori falling short both of the 

 edge and midrib. /Z. Sp. S. p. 110. Diplazium, Kunze. 



Hab. West Indies and Guatemala southward to Guyaquil. The diplazioid character 

 of the sori is sometimes clearly marked. 



71. A. auriculatum, Swartz ; st. tufted, 4-8 in. 1., firm, erect, nearly naked ; 

 //. 12-18 in. 1., 4-6 in. br., lanceolate-oblong, with 10-20 stalked horizontal 

 pinnce on each side, which are 2-4 in. 1., f-1 in. br., lanceolate, often subfal- 



