<>.v^. 



76 CONTEIBUTIONS FROM THE NATIONAL HERBARIUM. 



ANNOTATED CATALOGUE OF THE SPECIES OF VASCULAR PLANTS 



OF WASHINGTON. 



POLYPODIACEAE. Fern Family. 



Indusium wanting, the sori naked. 



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

 Sori round. 



Leaves pinnatilid ; sori lai^e , on t lie t ips of the veins Polypodium (p. 76) . 



Leaves ternate or twice to thrice pinnatilid; .sori small, on 



the backs of the veins Pheoopteris (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 Pteridium (p. 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"fal6e in- 

 dusium AdI ANTUM ( p. 78) . 



Sporangia on tlie 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 Wcx)DWARdi a ( 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, large, flaccid Athyrium (p. 80). 



Sori round. 



Indusium conspicuous, peltate or reniform. 



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

 Leaves membranaceous; indusium reuifoim. Dryqpteris (p. 81). 

 ludiuiium inconspicuous, not peltate or reniform. 



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

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



CEROPTERIS. 



1. Ceropteris triangularis (Kaulf.) Underw. Bull. Torr. Club 29: 630. 1902. 



Gold-back fern. 



Gymnogramme triangularis Kaulf. Enum. Fil. 73. 1824. 



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



Type locality: "Habitat in California." Collected by Chamisso. 



Range : 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 1. P. scouhri. 



Leaves membranous; veins free. 



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



Pinnae short, obtuse 3. P. hesperium. 



