326 BOTANY. 



2-5 transversely linear-oblong sub-continuous involucres.— Sp. Fil. ii, t. 

 75, A; not of Bory and Willdenow. Keyserling, Adiantum, p. 15, 37, No. 

 55. A. Chilense, Torrey in Botany of Parke's Survey, p. 21 ; Brackenridge, 

 Ferns of U. S. Expl. Exped. p. 97 ; D. C. Eaton, Botany of Mexican 

 Boundary, p. 233 ; and in Robinson's Catalogue of Ferns, not of Kaulfuss. 

 A. tenerum, Torrey in Emory's Notes of a Military Reconnoissance from 

 Fort Leavenworth to San Diego, p. 155. Newberry in Botany of William- 

 son's and Abbot's Survey, p. 93, not of Swartz. 



From San Diego, California, northward to Oregon, common, but apparently not occurring east of the 

 Coast Ranges. Stalks 6-12 inches long ; frond about tho same length, more than half as wide at the base, 

 gradually narrower upwards, tho pinnules +-1A inches broad, rounded, or the larger ones semicircular or 

 almost reuifonu, bearing at first a few scattered hairs along the veins, soon quite smooth. The pinnules 

 commonly have from one to four slight incisions on the rounded side. The very acute teeth of the sterile 

 pinnules having the vein extending to the point of the teeth, and the transversely linear involucres, 

 separate this from A. Chilense, with which I formerly confounded it, that species having the veins extend- 

 ing mostly to the notches between the teeth, and bearing more numerous lunulate involucres. The 

 figure given by Hooker in Species Filicum is very characteristic of the common Adiantum of California, 

 and does not represent any known plant of either Mauritius or Malacca. The specimen it was drawn 

 from is marked in Hooker's herbarium "Malacca, Griffith." It is on the same sheet with a specimen 

 more like a form of A. Capillus-Veneris, marked as coining from Delessert's herbarium, and collected in 

 the Mauritius. Mr. Baker suggested a possible interchange or crossing of the tickets, an accident too 

 common in all herbaria. Keyserling, who baa apparently not seen the specimens, says that the A. 

 emarginalum of Hooker's plate was " nach einem von B. Delessert hinterlassenen Exemplar, das vermuth- 

 lich aus Californien stainmt." It is probably too late to trace with certainty the history and origin of the 

 specimen figured, but it is enough that it accurately represents the Califoruian species, and none other. 

 The original A. emarginalum of Bory and Willdenow was confessedly " very liko the preceding [J. Capillus- 

 Veneris~\, but constantly smaller, the pinnules always obcordate and never lobed." Keyserling refers this 

 without hesitation to A. Capillus-Veneris, leaving the name free for the present species, for which it is not 

 especially appropriate, though I do not think it is to be rejected on the score of utter unfitness. 



Adaantum tricholepis, F6e. 



"Frond oval in outline; stalk and rachis smooth, polished, deep- 

 black; pinnules roundish, moderately long-petioled, hairy on both surfaces; 

 sori very few, of unequal size ; involucre very velvety ; rootstock creeping, 

 scaly, the scales linear, acuminate, tawny." — 8 me Me"m. p. 72. Keyserling, 

 Adiantum, p. 15^ 37, No. 56. A. Chilense, var. hirsutum, Hook. Sp. Fil. ii, 

 p. 43 (in part) ; D. C. Eaton in Bot. of Mexican Boundary, p. 233. A. 

 dilatatum, Nutt. MS. in herb. Hook., and quoted in Sp. Fil. 1. c. A. pilosum, 

 D. C. Eaton in Robinson's Catalogue, but not of Fee, which is A. Chilense, 

 var. hirsutum, Keyserl., from Cbile. 



In a rocky ravine near the mouthof the Rio Pecos, Western Texas, Dr. Bigelou: Monterey, California, 

 Nuttall. Mexico and Yucatan. This belongs to tho same group of species with the two last, a group 

 characterized by having fronds of a pyramidal outline, twice to four times piunate at the base, gradually 



