42 ADIANTUM. 



thin and membranaceous, stipes in general short and scaly 

 (scales deciduous) and as well as the very slender filiform 

 rachis flaccid brown shining glabrous or slightly squamose, 

 root fibrous. A. excisum, Kunze in LintKBU, p. 8-2. Ana- 

 lect. Plerid.p. 33, ^ 21. 



Hab. Chili, Pneppig. Valparaiso, Macrae, Cumim), n. 492, Bridges, n. 

 550. — I do not liiul lliat tliis retnarkahle species is taken up liy any author 

 except Kunze ; tliough it has been long in our herbaria. From a dense 

 fibrous root, the (ibres wiiy and cb)thed with rusty wool, arises a tuft of 

 fronds from a span to a foot at most in height including the usually short 

 stipes, and this stipes is partially scaly ; scales large, distant, lanceolate, 

 membranaceous, deciduous : the whole plant singularly weak and flaccid, 

 pellucid, but of a blackish green colour. The longest pinnules are scarcely 

 more than two lines long, flabelliform, with the nerves very few and distant, 

 so that never more than two communicate with the involucre: involucres 

 generally 2 or 3 on each pinnule, rarely 4. The texture of the frond is more 

 like that of Ci/stopleris fragilis than any Adiantum. It has no resemblance 

 to any other species of the genus : and has the smallest pinnules of any with 

 whicli I am acquainted. 



85. k. concmnum, H. B. K. ; frond large 1 — 2 feet long 

 tripinnate, pinnules all petiolulate membranaceous glabrous 

 rhomboid or rhombeo-obovate more or less obliquely cuneate 

 at the base inciso-lobate (rarely entire or obscurely lobed 

 and serrated), lobes obtuse mostly entire emarginate with 

 the lobules or segments connivent soriferous in the sinus, 

 lowest pinnules of each primary and secondary pinna erect 

 and appressed to the rachis (!), sori 8 — 10 on a pinnule reni- 

 form, stipes rather short, main rachis rather stout straight 

 partial ones slender, both stipes and rachis everywhere ebe- 

 neous glossy glabrous. H. B. K. Nov. Gen. et Sp. Am. i. p. 

 17, and 7, t. 668. Willd. Sp. PL v. p. 451. A. tenerum, 

 Schkulir, Fil. t. 121, {e.vl. the sf/n.) A. affine, Mart, and 

 Galeotti. Fil. Mex. p. 70 {not Willd.) A. cuneatum. Hook. 

 Jil. PL Galapag. Linn. Trans, xx. p. 168. — i3. pinnules entire 

 or nearly so. 



Hab. Caraccas, H. B. K., Mnritz. Central America and Guayaquil, 

 Chiming, n. 1154, Skinner, Barclay, Seemann. Chacapoyas, Peru, Ma- 

 theivs, n. 1850. Gallipagos, Dr. Scouler. Mexico, Galeatti, n. 6318 and 

 6436, Linden, nAS\, Jtirgemen. Jamaica, Mr. Fadijcn, Wilson, Purdie. 

 St. Vincent, L. Guilding. — /3. Andes of Quito, Prof. .Jameson, n. 16. — 

 No species can be more easily recognized than this, by a peculiarity faith- 

 fully represented in Humboldt's figure, less satisfactorily in Schkuhr's, and 

 clearly noticed by Willdenow, who ought to have introduced it into his 

 vague specific character: " Dignoscitur,'' he says, " facile pinnulis inferio- 

 ribus pinnarum primarium et secundarium rachi stipulag instar adpressis, 

 quae tamen ut omnes reliquae petiolatae sunt.'' Prof Jameson's entire-pin- 



