22 NORTH AMERICAN FLORA [VorumE 16 
2. Marattia Kaulfussii J. Smith; Hook. Gen. Fil. sué p/. 26. 1839. 
Lupodium Kaulfussii J. Smith ; Hook. Gen. Fil. pl. 178. 1842. 
Leaves up to 2 meters and more long, the stipe 60-90 cm. long ; lamina 90-120 cm. long, 
60 cm. or more broad, deltoid, tripinnate or quadripinnatifid as to the basal pinnae; pinnae 
30 cm. or more long, 15-20 cm. broad ; pinnules 8-10 cm. long, the rachis winged, the ulti- 
mate pinnules oblong, regularly pinnatifid, the lobes blunt; veinlets forking; synangia 
with a distinct stalk, distinctly intramarginal, deeply cleft, the valves spreading. 
TYPE LOCALITY: Dominica. 
DISTRIBUTION: West Indies to Colombia, Ecuador and Brazil. 
ILLUSTRATION: Hook. Gen. Fil. pl. 128. 
3. Marattia interposita Christ, Bull. Herb. Boiss. II.6: 285. 1906. 
Rhizome undescribed; leaves tripinnate (intermediate between those of M7. alata 
and M7. cicutaefolia of South America, hence the specific name), with smooth greenish 
rachises, the ultimate rachises narrowly winged, with a few scattered scales; pinnae 40 
cm. or more long, up to 35 cm. broad, broadly ovate, stalked, the ultimate pinnules mostly 
alternate, 2-6 cm. long, 6-7 mm. broad, dark-green above, paler below, naked, cuneate, 
narrowly acute or acuminate, with sharply but rather finely serrate, revolute margins ; 
veinlets mostly 1-2-forked, very oblique; synangia 6-8-locular, globoid, laterally compressed 
above, not deeply cleft or spreading. 
TYPE LOCALITY: Costa Rica, 
DISTRIBUTION: Known only from type locality. 
4. Marattia excavata Underwood, sp. nov. 
Rhizome erect, slender, 30-40 cm. high; leaves tripinnate with smooth olivaceous- 
brown rachises; pinnae stalked (5-15 cm.), with alternate rather closely placed pinnules ; 
pinnules short-stalked with a varying number of segments (up to 15 pairs) and ending in 
a slender serrulate undivided acuminate apical portion which may comprise the greater 
part of the pinnule; ultimate rachises with slight wings which are more pronounced towards 
the distal portions of the pinnules; ultimate pinnules 2.5~-3.5 cm. long, oblong to narrowly 
ovate, more or less falcate, obliquely excavate at the superior base, nearly sessile, the margins 
plane, sharply serrate, the apex mostly blunt, acutish or rounded; veinlets once-forked, 
bearing a single synangium near the end of the upper fork; synangia submarginal, rather 
deeply cleft but not widely spreading, pale-brown, about 8-10 to a pinnule, oval, usually 
with 5-7 loculi on each side. 
Type collected in humid forest, Coliblanco, Costa Rica, altitude about 2000 meters, May 1, 1906, 
Maxon 272. : 
DISTRIBUTION: Guatemala and Costa Rica. 
5. Marattia alata Sw. Prodr. 128. 1788. 
Marattia laevis Smith, Pl. Ic. Ined. pi. #7. 1790. 
Myriotheca alaia Poir.in Lam. Encyc. 4: 403. 1797. 
Myriotheca laevis Poir. in Lam. Encyc. 4: 403. 1797. 
Discostegia alata Presl, Abh. BOhm, Ges. Wiss. V.4: 272. 1845. 
Discostegia laevis Presl, Abh. BOhm. Ges. Wiss. V.4: 272. 1845. 
Rhizome very stout and fleshy ; leaves tripinnate or even quadripinnate as to the lower 
pinnae, up to 3 meters long, the stipe 30-60 cm. long, 2.5 cm. thick at the base, the 
rachis stramineous, sometimes darker, sparsely scaly, the ultimate rachises winged, scaly on 
the under side; lamina a meter or more long, broadest at-the base; pinnae up to 70 cm. or 
more long, oblong to deltoid; pinnules 10-25 cm. long, long-acuminate, the apices sharply 
serrate; ultimate pinnules 1-2.5 cm. long, 4-8 mm. broad, oblong or elliptic, more or less 
scaly underneath, unequally narrowed, cuneate, the apices acute to blunt, the margins sharply 
serrate; veinlets simple or once-forked ; synangia broadly oblong, rather shallow, 8-16-locu- 
lar, deeply cleft, the valves opening widely, the receptacle oblong or oval, usually scaly. 
TYPE LOCALITY: Jamaica. — 
DISTRIBUTION : Cuba, Jamaica, and Hispaniola. 
ILLUSTRATION : Hook. Gen. Fil. p/, 26. 
