—88— 



been reported from Vermont and may be looked 

 for with the type. 



60. Asplenktm vespertinum Maxon. Southern Cali- 



fornia. Has the appearance and habitat of 

 A. trichomanes with which it was formerly in- 

 cluded under the form incisum. 



61. Asplenium viride Huds. Green Spleenwort. Rare 



and local ; on rocks. Arctic Circle to Vermont, 

 Colorado and Oregon ; also in Northern Europe, 

 Japan and the Himalayas. 



Athyrium Roth. 



62. Athyrium cyclosorum Rupr. Western Lady Fern. 



Common; in moist shades. Alaska to Calif ornia, 

 Arizona and Nebraska. — Asplenium filix-foemina 

 cyclosorum Rupr. 



63. Athyrium filix-foemina (L.). Lady Fern; Female 



Fern; abundant; in woods, thickets, roadsides 

 and the borders of swamps. North America 

 generally, giving place in the west to A. cycloso- 

 rum ; also nearly throughout the world. A most 

 variable species. — Asplenium filix-foemina Bernh. 



More than twenty forms have been reported 

 from America, the most noticeable being angus- 

 tum, furcatum, incisum, laciniatum, molle, ovatum 

 and rubellum* Less important are confluens, 

 elegans, exile, interruptum, latifolium, laxum, 

 multifidum, pectinatum, plano-rhoeticum, poly- 

 clad os t rectangulare, rhoeticum and stenodon, 



64. Athyrium thelypteroides (Michx.). Silvery Spleen- 



wort. Not uncommon ; in moist shades. New 

 Brunswick and Nova Scotia to Minnesota and 

 south to the Gulf States; also in Eastern Asia. — 

 Asplenium thelypteroides Michx. ; Asplenium acros- 

 tichoides Sw. A form distinguished as acros- 

 tichoides Gilbert, has been reported from New 

 York. 



