ROBINSON: PTERIDOPHYTA OF THE HAWAIIAN IsLANDs 207 
branaceous; veins free in Hawaiian species; sori linear ‘upon the 
veins, usually oblique to the midrib or leading vein of the pinna, 
occasionally parallel with it; indusia attached to veins, opening 
towards the midrib; sori occasionally athyrioid or diplazioid. 
Leafblades simply pinnate. 
‘innae cau sy to rhomboidal or oblong, subentire. 
Rootstock creeping; leaves distant. A. unilaterale. 
haere short, erect; leaves cespitose. 
Leafstalk dull green, flexuose 
Pinnae rhomboidal to flabellate, occasion- 
ally distant, gradually reduced below. A. rhomboideum. 
Pinnae lente approximate, abruptly 
reduced bel A. lunulaium. 
Leafstalk dark Rise or black, ri 
Bl chartaceous; sori on veins pevatiel to 
the lower margin, opening upwards. A. monanthes. 
Blade subcoriaceous; sori on secondary 
veins, indusium opening toward pri- 
mary vein. 
Blade 2.5—10 cm. long; pinnae ovate to 
suborbicular. A. Trichomanes. 
Blade 15 cm. long; pinnae oblong. A. pavonicum. 
Pinnae lanceolate, margin serrate, incised, or lobed. 
alks green 
Pinnae auricled at base. A. pseudofalcatum. 
Pinnae not auricled at base. 
eafblade coriaceous; basal scales of leaf- 
stalk ovat 
Pinnae obtuse at apex; broadly ovate; 
sorus conterminous with vein; veins 
obscure. A. Kaulfussii. 
Pinnae caudate; sorus shorter than 
vein; veins distinct. A. kauaiense. 
Leafblade chartaceous; basal scales lance- 
olate or linear. 
Leafblade 30-35 cm. long, oblong- 
ovate; basal scales of leafstalk lan- 
ceolate. 
A. enatum. 
Leafblade 20-25 cm. long, oblong-lan- 
ceolate; basal leafstalk 
lin A. Hillebrandii. 
Leafstalks brown or 5 stee-blue. 
Pinnae serrate or in < 
e caudate. 
imary veins parallel to the midrib. A. contiguum, 
Primary veins divergent from the mid- 
rib. A. caudatum. 
