ADIANTUM. 17 



large pinnules approximate tapeinng upwards gradually to 

 a small point chartaceo-membranaceous scarcely glossy, 

 sterile ones large (2 inches and more long) acuminate lobed 

 and serrated, fertile ones and those of the simply pinnated 

 and those of the terminal pinna large (1^ — 2 inches), those 

 of the lower pinna? much smaller, all lanceolate acumi- 

 nate or acute arc uato- falcate coarsely serrated at the apex, 

 upper base truncated parallel and close to the rachis often 

 forming a sharp auricle, lower margin dimidiate, sori linear 

 solitary arcuate generally confined to the base of the upper 

 margin very rarely appearing on the lower, stipes ebeneous 

 shining, rachis slightly rough with ferruginous hairs. — Presl, 

 Reliq. HiBuk. ;?. 61, Tab. 10,/. 3. 



Hah. Guayaquil and Mexico, Hce^iAe; apparently entirely confined to 

 the Pacific side of Mexico and Colunihia. I possess specimens, sent from 

 Guayaquil, Solanga, Buba, and Gorgona, by Messrs. Jameson, Hinds, Bar- 

 clay and Sceman. — Presl's figure is an admirable representation of this plant, 

 in a state, intermediate, as it were, between the simply pinnate and the bi- 

 pinnate form. In the more fully developed form, the pinnules of the lower 

 pinnae have a good deal of affinity with A. pulverulentum, but they are more 

 falcate, while the sterile pinnules and those of the terminal pinnse have 

 quite a peculiar aspect, and are so large that I have measured some three 

 inches long, they are singularly falcate and much and finely acuminated. 

 I consider the species very distinct, and its circumscribed locality seems to 

 strengthen the view of its being so. If it is a form of ^. pulverulentum it 

 would be likely to appear in other parts of tropical America, where that 

 species is so abundant. 



34. A. ptdverulentum^ 1j. ; frond large (1 — 2 ft.) broadly 

 ovate bipinnate, pinnaj lanceolate, pinnules close ninnerous 

 gradually becoming smaller to the point shortly petiolate rather 

 membranaceous than coriaceous full green glossy oblong di- 

 midiate obtuse upper base truncate parallel with and close to 

 the rachis lower ones deltoid uppermost ones very small narrow 

 almost obovate, sori linear continuous only occupying the 

 superior (or part of the superior) margin, rachis and stipes 

 rough with ferruginous hairs. — Willd. Sp. PL p. M6. Stv. 

 Syn. Fil. t. 119 {good). Plum. Fil. t. 5, f. 7. A. umbrosum, 

 mild. Sp. PI. v. p. 447 (Pr.). A. monosoratum, IVilld. I. c. 

 p. 445 ? A. Kunzeanum, Pr. Tent. Pterid. p. 157 .-' [name). 



Hab. West Indian Islands, frequent ; Tropics of America, as Mexico, 

 New Grenada, Guiana, and Brazil. — A more tender and membranaceous 

 plant than A. villosum, with smaller, more copious and much denser pin- 

 nules, tapering gradually to the narrow point, obtuse, except when ste- 

 rile and bearing a solitary line of fructification on the upper margin only, 

 and generally not occupying the whole length of that. Presl makes a new 

 species {A. Kunzeanum) of Kunze's A. pulverulentum from Cuba {Poeppiif) ; 

 but as my specimen of Poeppig's plant in no way differs from the true jmlve- 



D 



