580 RoBINSON: PTERIDOPHYTA OF THE HAWAIIAN ISLANDS 
O.  DIELiIA: Brack. Pil. Us: 5S. Expl. Exp: 217.18 
Rootstock short; leaves cespitose; veins forking, uniting to 
form oblique areolae, free at the margin of the leaf or united by a 
transverse vein upon which the sporangia are borne; sori distinct; 
indusium linear-oblong, parallel to the margin of the leaf and 
opening outward. 
Type species: Diellia erecta Brack. 
Leaf blades pinnate. 
Leafstalk and midrib smooth. 
Pinnae not more than 3 mm. broad, linear, zigzag from the 
alternate crenations of the margin. D. centifolia. 
Pinnae more than 3 mm. 
Leaf 8-10 cm. high, coriaceous; pinnae rhomboid-ovate 
above, orbicular below. D. pumila. 
Leaf more than 10 cm. high, chartaceous; pinnae 
lanceolate, chiens D. erecta. 
Leafstalk and ae ibs 
Pinnae cut into pereen segments. D, Alexandri. 
Pinnae not cut into cuneiform segments. 
Pinnae lanceolate, acute, repand. D, falcata. 
Pinnae el caudate, laciniate. D., laciniata. 
Leaf blades tripinnatifid to innate. 
lades tripinnatifid, pty -jugate. D. Knudsenit. 
Blades quadripinnatifid, 40-50-jugate. D. Mannii. 
Diellia centifolia (Hilleb.) comb. nov. 
Lindsaya centifolia Hilleb. Fl. Haw. Is. 621. 1888. 
TYPE LocALITy: Halemanu, Kauai. 
DISTRIBUTION: Known from type locality only. 
ILLUSTRATION: Diels in E. & P. Nat. Pfl. 1*: 211. f. 114D. 
1899. 
SPECIMENS EXAMINED: Kauai, Knudsen 35 (type) B. 
It seems possible that Diellia centifolia may have arisen from @ 
cross between Diellia falcata and Diellia Alexandri, by which it 
inherited the position of the sori from the former parent and the 
modified form of the pinnae from the latter parent. 
Dr1e.uia pumiLa Brack. Fil. U. S. Expl. Exp. 219. 1888 
TYPE LOCALITY: Oahu. 
DISTRIBUTION: In crevices of rocks, rare; Oahu, Hawaiian 
Islands. 
