416 60. ACROSTICHUM, * ACONIOPTERIS AND OLFERSIA, ** STENOSEMIA. 



entire or cleft, the outer edge crenate or dentate ; texture subcoriaceous ; fertile 

 fr. J in. br., orbicular. JEfifr. Sp. 5. p. 252. Ic. t. 96. ft A. tripartitum, Hk. ; 

 'barren fr. 2-3 times dichotomously forked, with cuneate or ligulate ult. divisions. 

 Hk. & Gr. t. 118. 



Hab. New Granada to Peru. 



86. A. (Rhip.) peltatum, Sw. ; rhizome slender, wide-creeping ; st. distant, 

 slender, 1-3 in. 1., scaly throughout ; barren fr. 1-2 in. each way, repeatedly 

 dichotomously forked, with narrow linear ultimate divisions J-^ lin. br. ; texture 

 subcoriaceous ; fertile fr. % in. br., often 2-lobed. Hk. Sp. 5. p. 252. 



Hab. Mexico and West Indies to Peru and Brazil. 



87. A. (Rhip.) fceniculaceum, Hk. ; rhizome slender, wide-creeping ; st. distant, 

 slender, 2-8 in. ]., scaly throughout ; sterile fr. 1-2 in. br., very often dichoto- 

 mously forked, with filiform ultimate divisions ; texture subcoriaceous ; fertile fr. 

 f in. br., 2-lobed. Hk. Sp. 5. p. 253. Hk. $> Gr. t. 119. 



Hab. Andes of Ecuador, Jameson, Spmce. 



Veins anastomosing. Sp. 88-132. * 



* Veins united only near the margin. Sp. 88-90. 

 t Fronds simple. Aconiopteris, Presl. Sp. 88-89. Fig. 60. p. 9. 



88. A. (Aeon.) subdiaphanum, Hk. & Gr. ; caud. woody, erect ; st. tufted, 2-6 

 in. !., firm, erect, scaly ; barren fr. 4-8 in. 1., 1-1^ in. br., both ends narrowed, 

 the edge entire ; texture subcoriaceous ; veins beneath very prominent, united by 

 a zigzag veinlet just within the edge ; fertile fr. much narrower, on a longer 

 stem. Hk. Sp. 5. p. 256. Hk. & Gr. t. 105. 



Hab. St. Helena. 



89. A. (Aeon.) gorgoneum, Kaulf. ; st. tufted, firm, erect, 1-2 in. 1., passing 

 gradually into the barren fr. 9 which is 6-15 in. 1., 2-3 in. br., the point acute, 

 the lower two-thirds narrowed very gradually, the edge entire ; texture sub- 

 coriaceous ; surfaces naked; veins united by a straight veinlet just within the 

 margin ; fertile fr. smaller, narrower, on a st. 6 in. or more 1. Hk. Sp. 5. 

 p. 254. 



Hab. Sandwich and Society Isles. Habit of A. latifolium. 



ft Fronds pinnate. Olfersia, Raddi. Sp. 90. Fig. 60. m, n, o. 



90. A. (Olf.) cervinum, Sw. ; rhizome woody, creeping, densely clothed with 

 long linear scales ; st. 1 ft. or more 1., scaly downwards ; barren fr. 2-4 ft. 1., 

 simply pinnate ; pinnae 4-9 in. 1., 1-2 in. br., entire or nearly so, unequal at the 

 base ; texture coriaceous, naked ; veins prominent, united just within the edge 

 by a straight veinlet ; fertile pinnae distant, linear-lanceolate, bipinnate, with 

 short spreading subcylindrical pinnl. Hk. & Gr. t. 81. Fil. Ex. t. 43. ft O. 

 corcovadensis, Raddi ; fertile fr. simply pinnate only, the pinnse unbranched. 

 Hk. Sp. 5. p. 254. 



Hab. Cuba and Mexico to South Brazil and Peru. The extremes look very different, 

 but are connected by intermediates. There is a form with the barren pinnae deeply 

 pectinato-pinnatifid. 



* Stenosemia, Presl. Veins forming one or two rows of areolce against the 

 midribs, the rest free. Sp. 91. Fig. 60. r, s. 



91. A. (Steno.) aitritum, Sw. ; caud. erect, woody ; sterile fr. with a st. 6-9 

 in. 1., deltoid, 8-] 2 in. each way, ternate, the central segm. deeply pinnatifid, 



