400 KEYS TO THE FERNS OF 
di. Frond without lime dots. 
e. Main veins nowhere prominent. 
/. Sori small, superficial 
ft. Sori large, somewhat immersed 
ei. Main veins prominent. 
/. Base abruptly narrowed, practi¬ 
cally sessile 
ft. Base gradually narrowed to a 
wing. 
g. Sori mostly in 2 distant 
irregular rows 
g 1 . Sori numerous, scattered' 
a. Main veins prominent, but abruptly 
turning to cross-veins. 
d. Base gradually narrowed 
di. Base abruptly narrowed, practically 
sessile 
a 3 . Fronds dichotomously lobed 
a\. Fronds pinnately lobed or divided. 
b. Sori superficial. 
c. Lowest segments net reduced. 
d. Margin entire or wavy. 
e. Frond less than 25 cm. tall 
ei. Frond over 50 cm. tall 
di. Margin of lobes toothed. 
e. Paleae dark, not awned 
ei. Paleae light, hair-tipped 
a. Lowest segments reduced 
b 1. Sori immersed. 
c. Frond not dimorphous. 
d. Sori not in 1 regular row on each 
side 
di. Sori in 1 regular row on each side. 
e. Sori slightly immersed 
ei. Sori deeply immersed, prominent 
above. 
f. Venation obscure 
fi. Venation conspicuous. 
g. Segments more than ten pairs 
gi. Segments less than ten pairs 
ci. Fronds dimorphous 
a 5 . Fronds pinnate. 
b. Fronds without lime-dots 
b 1. Fronds marked above with lime-dots. 
c. Texture flaccid 
ci. Frond coriaceous 
BORNEO 
80. P. pnnetatum. 
92. P. phymatodes. 
81. P. musifolium. 
84. P. Zippelii. 
85. P. heterocarpum. 
83. P. myriocarpum. 
82. P. lingua forme. 
86. P. ceratophyllum.. 
87. P. paueijugum. 
88. P. commutation. 
89. P. ebenipes. 
90. P. palmatum. 
93. P. grandidentatum. 
92. P. phymatodes. 
91. P. macrochasmum . 
94. P. ithycarpum. 
95. P. longissimum. 
96. P. nigrescens. 
97. P. incurvatum. 
90. P. palmatum. 
98. P. subaquatile. 
99. P. albidosquamatum » 
