polypodiace^:. 255 



From the Sandwich Islands we have two states of this : one with 

 stipes from 3 to 5 inches long ; the fronds elongated-lanceolate, tri- 

 pinnatifid, and from 12 to 18 inches in length ; the indusium supra- 

 axillary, free, cylindrical, long, and tapering at the base, with a 

 slightly spreading entire mouth : this form inhabits shady forests. 

 The other form has sessile fronds (or the stipes not over an inch in 

 length), oblong-lanceolate, tripinnatifid, and from 5 to 6 inches long; 

 the indusium shorter and more spreading at the mouth : this is 

 found in exposed situations. The Brazilian plant, in the outline of 

 its fronds and the length of the stipe, resembles the larger elongated 

 form from the Sandwich Islands ; but its primary divisions are more 

 distant, the lacinise and wings of the rhachis much narrower. In the 

 two latter the form and position of the indusium are similar, and it is 

 not decidedly two-lipped. 



Sir William Hooker in his Species Filicum has, perhaps justly, 

 included under T. radicans a vast assemblage of species of various 

 authors, and from widely remote countries. 



13. Trichomanes brachypus, Kunze. 



Trichomanes Irachypus, Kunze, ex Hook. Spec. Fil. 1, p. 121. 

 T. radicans, Hook. & Grriv. Ic. Fil. t. 218, excl. syn. 



Hab. Vicinity of Rio Janeiro, and Organ Mountains, Brazil. 



Rootstock very long, slender, and creeping. Fronds sessile, ovate- 

 oblong or oblong-lanceolate, bipinnatifid. Primary divisions diver- 

 gent; the ultimate divisions once or twice divided into short and 

 obtuse laciniae. 



The collection contains a considerable number of specimens (all 

 of them sterile) of what we take for a state of T. brachypus, Kunze, as 

 described by Sir William Hooker in his Species Filicum, and pre- 

 viously figured in the Icones Filicum, under the name of T. radicans. 

 In the figure the primary segments are represented as being more 

 horizontal than we find them in our specimen. 



