76 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



ANNOTATED CATALOGUE OF THE SPECIES OF VASCULAR PLANTS 



OF WASHINGTON. 



POLYPODIACEAE. Fern Family. 



Indusium wanting, tlie sori naked. 



Son elongated, following the veins, often branched or netted. . Ceropteris (p. 76"). 

 Sori round. 



Leaves pinnatiiid; sori large, on the tips of the veins Polypodium (p. 76). 



Leaves ternatc or twice to thrice pinnatifid; sori small, on 



the backs of the veins Phegopteris (p. 77) . 



Lidusiuni pi'csent. 



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 Pteridium Cp. 78). 



Sporangia at or near the ends of unconnected veins. 



False indusium continuous Pell.\ea ( p. 78). 



False indusium not continuous. 



Sporangia on the under side of the fake in- 

 dusium - AuiANTUM ( p. 78) . 



Sporangia on the leaf surface l)eiieatii 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 r.like Woodwardia (p. 79). 



Fruit veins not parallel to the midrib; sori not linear. 

 Sori oblong, on oblique veins. 



Leaves pinnate, small, firm Asplenium (p. 80). 



Leaves bipinnate, targe, flaccid Athyrium (p. 80). 



Sori round. 



Indusium conspicuous, peltate or reniform. 



Leaves firm, coriaceous; indusium peltate.. Polystichum (p. 80). 

 Leaves membranaceous; indusium reniform. Dryopteris (p. 81). 

 Indusium inconspicuous, not peltate or reniform. 



Indusium under the sorus, stellately divided. Woodsia (p. 82). 

 Indusium hooded, fixed by a broad base. .. . Filix (p. 82). 



CEROPTERIS. 



1. Ceropteris triangularis (Kaulf.) Underw. Bull. Torr. Club 29: 6.30. 1902. 



Gold-back ferx. 



GyinruMjrainnte triangularis Kaulf. Enum. Fil. 73. 1824. 



Gymnopteris triangularis Underw. Our Native Ferns ed. 6. 84. 1900. 



Type locality: "Habitat in California." Collected b}' Chamisso. 



Eange: British Columbia to California and Arizona. 



Specimens examined: San Juan Island, Gardner .392. Also reported from Eatonville, 

 Fhtt, and from near Port Angeles. 



Zonal distribution: Humid Transition. 



POLYPODIUM. 



Leaves leather}' ; veins more or less netted LP. scouleri. 



Leaves membranous; veins free. 



Pinnae attenuate, acute or acuminate 2. P. occidentale. 



Pinnae short , obtuse 3. P. hesperium. 



