44 



45. P. pubescens, Radd. 



46. P. gracilentum, Jenm. 



47. P. ctenoides, Fee. 



48. P. Thomsonii, Jenm. 



49. P. decussatum, Linn. 



50. P. caudatum, Kaulf. 



Fronds decompound. 



51. P. punctatum, Thunb. 



52. P. rugulosum, Gabill. 

 II. Yeins united. 



Fronds not articulated at tbe base of tbe stipe. Goniopteris, Presl. 



Fronds pinnate or bipinnatifid ; opposite veins mating with 

 a branch running to tbe veins. 



53. P. nigrescentium, Jenm. 



54. P. obHteratum, Swartz. 



55. P. crenatum, Swartz. 



56. P. tetragonum, Linn. 

 Fronds articulated at tbe base of tbe stipe, leaving a clean scar 



at parting. 

 Fronds pinnatifid or pinnate. 



Fronds coated with matted scales, veins areolate in 1-2 series, 

 •with free exterior branches — Lepycistis, J. Sm. 



57. P. incanum, Swartz. 



58. P. thyssanolepis, P. Br. 



59. P. squamatum, Linn. 



60. P. lepidopteris, Kze. 



Veins areolate, hexagonal, in one to several series, with 

 usually rather stronger primary veins running from the costae 

 to the margin, exterior branches free ; sori terminal on free in- 

 cluded veinlets. — Goniophlebium, Blume. 



61. P. loriceum, Linn. 



62. P. Chnoodes, Spreng. 



63. P. attenuatum, H. B. K. 



64. P. neriifolium, Schk. 



65. P. surrucuchense, Hook. 

 Veins forming copious narrow elongated angled areola?, with 



or without stronger primary veins, costal series transverse to 

 the rest : sori terminal on simple or united included veinlets or 

 compital. — Phlebadium, R. Br. 



66. P. aureum, Linn. 



67. P. decumanum, "Willd. 

 Areolae 1-2 serial ; pinnae linear strict. Pleopeltis, Ham- 



boldt. 



68. P. retrafolium, Jenm. 



Fronds simple entire. 



Primary veins costae-form, raised, parallel, the intervening 

 areolae fine and uniform ; sori compital, large, uniserial 

 between the primary veins. — Pleuridium, Fee, J. Sm. 



69. P. crassifolium, Linn. 

 Primary veins generally as in Pleuridium but connected by 



transverse, mostly arcuate slender veins, which together 

 form oblong areoles, in 2-several series, containing usual- 



