THE FERNS OF NICARAGUA. 



153 



This species has the margin of the pinnae more or less 

 reflexed over the sori. or at least curved downward so that a 

 double involucre is seemingly formed, and consequently ap- 

 proaches the sub-genus P<Bsia of Ptcris, or Isoloma of Liiid- 

 saya. It also simulates some of the once-pinnate forms of the 

 sub-genus E after is in venation, texture and division. Its right 

 to a place in the genus Davallia is somewhat questionable. 



The fronds are from 2 to more than 4 feet in length, dark- 

 green, lance-ovate, and with brown stipes which are roughened 

 with scattered tubercles or short spines. The bases of the 

 pinnae vary from short-cuneate and equal, to decidedly unequal, 

 the upper side in the latter forms being more rounded, and 

 extending nearer to the rachis. The upper pinnae are sessile 

 and often slighty decurrent on the rachis, the lower are short- 

 stalked. 



2. D. inequalis Kunze. PI. xii. Figs. 5, 6. 



Hook., Sp. FiL, vol. 1, p. 1S0, pi. lvii B; Eaton, Fil. Wr. et Fend., p. 212; 

 Hook, and Bak., Svn. Fil., p. 99; Hems]., Biol. Cent. Am., vol. m, p. 

 605; Bak., Biol. Cent. Am., vol. iv, p. 115 (from Costa Rica). 

 Microlepia inequalis Presl, Tent. Pter., p. 125. 



The largest fronds which were observed measured 2% feet 

 in length. The stipes are smooth, light-brown. Hooker's 

 figure exactly represents the Nicaraguan specimens. 



Terrestrial in habit. Not rare in the deep woods near 

 Camp Menocal. 



New to the Nicaraguan list. 



Family IV. DICKSONIE^. 

 Genus DICKSONIA UHerit. 

 1. D. adiantoides H. B. K. PI. xii, Figs. 7, 8. 



Presl, Rel. Haenk., p. 67: Hook., Sp. Fil., vol. 1, p. 75, pi. xxvi B; Lieb., 

 Mex. Breg., p. in; Eaton, Fil. Wr. et Fend., p. 214; Hook, and Bak., 

 Svn. Fil., p. 52; Hems]., Biol. Cent. Am., vol. m, p. 596. 



D. erosa Kunze, — Hook., Sp. Fil., vol. 1, p. 75. 



Sitolobium adiantoides Smith, Ferns, Brit, and For., p. 236. 

 IV— 2 M 2 



