138 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Rhizomes large, woody, elongate (2 to 10 
cm. long); fronds densely imbricate, 
erect. 
Indusia entire, usually narrow and elon- 
<n 17. A. monanthes. 
Indusia noticeably erose, more ample, 
short and relatively very broad...... 12. A. castaneum., 
1. Asplenium trichomanes L. Sp. Pl. 1080. 1753. 
Phyllitis rotundifolia Moench, Meth. Pl. 724. 1794. 
Asplenium saxatile Salisb. Prodr. Stirp. 403. 1796. 
Asplenium melanocaulon Willd. Enum. P1. 1072. 1809. 
Asplenium microphyllum Tineo in Gussone, FI, Sic. Syn. 2': 884. 1844. 
Type Locauity: Europe. 
DisTRiBUTION: Generally distributed in Europe, and in North America from Alaska 
and the region of Hudson’s Bay southward to Alabama, Texas, and Arizona. 
-Intustrations: Schkuhr, Krypt. Gewichs. 1: pl. 74; D. C. Eaton, Ferns N. Amer. 
1: pl. 36. f. 1-3; Moore, Brit. Ferns Nat. Pr. 2: pl. 75; Williamson, Ferns Kentucky pl. 
16; Bolton, Fil. Brit. pl. 18; Hook. Fl. Lond. pl. 156; Sowerby, Ferns Great Brit. 
pl. 80. 
Asplenium trichomanes, as represented by the common plant of Europe and North 
America, is too well known to require redescription or full citation of its very numerous 
illustrations, and it is doubtful whether in its typical form it occupies a much wider 
area. Certainly the writer has seen no material from other regions which is unmis- 
takably the same. Thus, Asplenium anceps von Buch,! illustrated by Hooker and 
Greville,? appears to be a distinct species, though not so regarded by Milde.? Although 
it has been attributed to Great Britain it is apparently confined to the Azores and 
Canary Islands. <Asplenium newmant Bolle,‘ founded upon specimens from Palma, 
of the Canaries, is a related species recognized by both Milde and Christensen. 
Of the Asiatic specimens of this alliance there are more distinct specific forms 
than have as yet been recognized. That which approaches North American speci- 
mens most closely is found in Japan, but it differs materially in several important 
particulars and probably represents a valid species about equally related to Asplenium 
trichomanes and A. anceps. Out of the Chinese material the writer has segregated 
A. microtum,° and Copeland has published also A. stantoni,® from Luzon, both of 
which, as well as A. densum Brack. ,’ a native of the Hawaiian Islands, seem to be well 
founded. These, together with additional material from Central China, South Africa, 
and New Zealand, will be considered separately at a later time, since their status 
does not affect materially that of the species here discussed. 
2. Asplenium underwoodii Maxon, sp. nov. Fiaure 1, 
Rhizome ascending, slender, 4 to 5 mm. in diameter, at the summit densely pale- 
aceous, the scales rigid, linear-lanceolate, attenuate, opaque, dark brown, about 3 mm. 
long; fronds few (4 to 10), radiating, somewhat arcuate toward the base, 12 to 21 cm. 
long (averaging about 16 cm.); stipe 2.5 to 6.5 cm. long (averaging about 3.5 cm.), 
very slender and fragile, deep purplish black, somewhat lustrous, both stipe and 
rachis very narrowly alate, the wings subentire; lamina linear, 9 to 14.5 cm. long, 
1 Beschr. Canar. Ins. 189. 1825. 
* Icon. Fil. 2: pl. 195. 1830. 
3 Fil. Eur. Atlant. 62. 1867. 
* Bonplandia 7: 106. 1859, 
° Contr. U. 8. Nat. Herb. 12: 411. pi. 60. 1909. 
° Philippine Journ. Sci. Suppl. 1: 151. 1906. 
In Wilkes, U.S. Expl. Exped. 16: 151. pl. 20. /. 3. 1854. 
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