76 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
ANNOTATED CATALOGUE OF THE SPECIES OF VASCULAR PLANTS 
OF WASHINGTON. 
POLYPODIACEAE. FERN Famiy. 
Indusium wanting, the sori naked. 
Sori elongated, following the veins, often branched or netted... CERopTERis (p. 76). 
Sori round. 
Leaves pinnatifid; sori large, on the tips of the veins. . -- - PotyropiuM (p. 76). 
Leaves ternate or twice to thrice pinnatifid; sori sroall, on 
the backs of the veins. .......-.-.-------------+--- PHEGOPTERIS (p. 77). 
Indusium present. 
Sori marginal covered by the more or less modified margin 
of the leaf (false indusium). 
Sporangia on a marginal vein which connects the ends 
of the lateral veinlets...........-.---.------------- Preripium (p.’78). 
Sporangia at or near the ends of unconnected veins. 
False indusium continuous ......---.------------- PELLAEA (p. 78). 
False indusium not continuous. 
Sporangia on the under side of the false in- 
dusium .........-.-.--------------------- ADIANTUM (p. 78). 
Sporangia on the leaf surface beneath the false 
indusium .....--------------------------- CHEILANTHES (p. 79). 
Sori not marginal nor covered by a false indusium. 
Fruit-bearing veins parallel to the midrib; sori linear. 
Sori nearest to the margin; leaves of two sorts -.-.- STRUTHIOPTERIS (79). 
Sori nearest to the midrib; leaves all alike ......--- WoopwakDia (p. 79). 
Fruit veins not parallel to the midrib; sori not linear. 
Sori oblong, on oblique veins. 
Leaves pinnate, small, firm..............-.2-.. ASPLENIUM (p. 80). 
Leaves bipinnate, large, flaccid... ....-...-.-- ATHYRIUM (p. 80). 
Sori round. 
Indusium conspicuous, peltate or reniform. 
Leaves firm, coriaceous; indusium peltate.. PotysticHum (p. 80). 
Leaves membranaceous; indusium reniform. DRryYOpTeRis (p. 81). 
Indusium inconspicuous, not peltate or reniform. 
Indusium under the sorus, stellately divided. Woopsta (p. 82). 
Indusium hooded, fixed by a broad base. ... Finrx (p. 82). 
CEROPTERIS. 
1. Ceropteris triangularis (Kaulf.) Underw. Bull. Torr. Club 29: 630. 1902. 
- GOLD-BACK FERN. 
Gymnogramme triangularis Kaulf. Enum. Fil. 73. 1824. 
Gymnopteris triangularis Underw. Our Native Ferns ed. 6. 84. 1900. 
Type Locauity: ‘‘ Habitat in California.”” Collected by Chamisso. 
Rance: British Columbia to California and Arizona. 
SPECIMENS EXAMINED: San Juan Island, Gardner 392. Also reported from Eatonville, 
Flett, and from near Port Angeles. 
ZONAL DISTRIBUTION: Humid Transition. 
POLYPODIUM. 
Leaves leathery; veins more or less netted. ...... wee cece ee eee eee 1. P. scouleri. 
Leaves membranous; veins free. 
Pinnae attenuate, acute or acuminate..................-------- 2. P. occidentale. 
Pinnae short, obtuse. .......... 00-20. -e ee eee ee ee eee eee 3. P. hesperium. 
