146 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
the inner margin and bearing only 3 or 4 sori each. The first is shown in figure 5; 
the second in figure 6. In minute characters the two plants are identical, and a 
similarly pronounced variation in leaf form, venation, and fertility is observed in 
specimens from other localities, notably in a series 
collected by the writer at the summit of the Volcano 
Agua. The thin, flaccid, transparent, reticulate, dull- 
brownish scales, which are both conspicuous and 
numerous, are characteristic (see fig. 7). From the 
exceedingly fertile, high-mountain form of A. monan- 
thes, which is sometimes known as A. polyphylluim 
Bertol. (shown in pl.1, figs. h, 7, k), A. castaneum may 
be distinguished readily by its relatively broader and 
differently shaped pinns, by its shorter and broader, 
decidedly erose indusia, and by the different character 
of the rhizome scales. It has been fully described by 
Mettenius! and it is not likely to be confused with 
any other American species. 
The following specimens of A. castaneum have been 
examined: 
Mexico: Subalpine region of Mount Orizaba, 
among rocks, March, 1908, Purpus(N). Same 
locality, Rose & Hay 5746(N). Same locality, 
alt. about 4,270 meters, Seaton 245 (N, G). 
Same locality, alt. about 3,300 meters, Seaton 
Fie. 5.—Asplenium castaneum. 
Pringle’s 6150. Scale 2. 
163 in small part (N). Same locality, alt. 4,500 meters, Jared G. Smith 90 (N ). 
Mount Popocatepetl, alt. about 3,600 meters, Rose 4: Hay 5988 (N). Mount 
Ixtaccihuatl, among rocks, alt. 3,050 to 3,350 
meters, Purpus 226(N). Volcano of Colima, 
Jalisco, Jones 526 (N). Sierra de las Cruces, 
State of Mexico, alt. 3,650 meters, Pringle 5191 
(P, G). Same locality, Pringle 6150 (G, M, 
N, Y, P, Gilbert). Nevada de Toluca, State 
of Mexico, alt. 3,080 to 3,230 meters, Rose & 
Painter 7943 (N). 
GuateMALA: Volcan de Agua, crevices of cliffs near 
the summit, alt. 3,750 meters, J.D. Smith 2446 
(N); J.D. Smith 2449 (G,N, Y); Mazon & Hay 
3696 (N). Same locality, in crevices of rocks, 
lower rim of crater, Mazon & Hay 3697 (N). 
Volcano Atitlan, Dept. Sololé, Kellerman 5795 
in part(N). Topof Volcan de Fuego, Salvin &: 
Godman 225 (G). 
Panama: Rocks near El Potrero Camp, Chiriqui 
Volcano, alt. 2,890 meters, Mazon 5326 (N). 
Near summit of Chiriqui Volcano, alt. about 
3,300 meters, Maxon 5367 (N). 
Perv: Obragilla, Wilkes Expedition (N). 
Ecuapor: Without locality, Sodiro (N, Y). 
Fig. 6.—Asplenium castaneum. 
Pringle’s 6150. Scale 2. 
Bouivia: Unduavi, alt. about 3,050 meters, Rusby 407, as A. extenswm (N, Y). 
13. Asplenium formosum Willd. Sp. Pl. 5: 329. 1810. 
? Asplenium nanum Willd. Sp. Pl. 5: 323. 1810. 
Asplenium subalatum Hook. & Arn. Bot. Beechey Voy. 312. 1840. 
Asplenium formosum B subalatum Moore, Ind, Fil. 133. 1859. 
1 Abh. Senckenb. Ges. Frankfurt 3: 181. 1860. 
