A new Asplenium, hitherto referred to A. Trichomanes van 



incisum Moore* 



By William R. Maxon 



Asplenium vespertinum 



Rhizome short, sub-erect, rootlets rather coarsely fibrous : 

 stipes purplish brown, shining, closely tufted, slender, terete, from 

 1.2—3.5 cm. long ; scales small, those at base of stipe dark, lance- 

 acuminate, serrate, those above blackish, filiform, scattered or al- 



most wanting: lamina linear, 7.5-22.5 cm. long: pinnae 20-30 



pairs, sub-opposite to alternate, sub-sessile, oblong-linear to 

 oblong, or even rhomboidal, somewhat reduced, reflexed and cord- 

 ate-clasping below, the margins regularly and coarsely crenate- 

 serrate, each lobe containing a simple vein ; pinnae more or less 

 auricled above at the base, the vein once or twice forked : sori 

 rather short, 8-12 to the pinna, an odd one often borne on the 

 auricle ; indusium glabrous, regularly crenate ; sporangia cinnamon- 

 brown ; annulus with 20 or more joints ; spores dark brown, ovoid, 

 the winged ridges rather closely reticulated. 



Type specimen in the U. S. National Herbarium, no. 201 581, 

 collected on San Miguel Mountain, near National City, San Diego 

 County, California, about Feb. 1, 1900, by Miss Laura F. Kim- 

 ball of National City. Other specimens which I have examined 

 and would refer to this species are the following : 



In U. S. Nat. Herb.: no 299603, " San Diego, Cal., D. Cleve- 

 land" ; nos. 238082, 31 1552, "Santa Ysabel (San -Diego Co.), 

 Cal., April 29, 1893, H. W. Henshaw " ; no. 220713, "Near 

 San Rafael (Lower California), Mexico, April 13, 1882, Marcus 

 E. Jones, 3749-" 



M 



. . 



» » 



In herb. D. C. Eaton : " San Diego, Cal., Miss Barbeck, 1879 ; 

 Near Poway, San Diego County, Cal., Wm. Stout, 1878; 

 " Tufts under rocks, Cajon Pass (San Bernardino County), near 

 San Diego Mission, California, Nov. 9, 1857, Dr. Newberry;" 

 " 1 88 1, C. C. Parry," probably collected in the vicinity of San 

 Diego. 



In herb. A. A. Eaton, Seabrook, N. H.: "Witch Creek, San 



* Published by permission of the Secretary of the Smithsonian Institution 



( 197 ) 



