__ In regard to 7r. Vitturia of De Cand. and others, having no 
intermediate specimens at the time I published my figure and 
description of that plant, I expressed myself inclined to adopt 
De Candolle’s view of its distinctness. But in my ‘Species Fi- 
licum ’ I united them, and, to my great satisfaction, I have since 
received perfect specimens of the simple and the pinnated form 
arising from one and the same root! gathered by Mr. Spruce in 
the forest near Para, which I hope will settle the question of 
their identity. Tr. pennatum, retained by most authors, is con- 
sidered by J. G. Sturm to be identical with Zr. floribundum of 
Hook. and Grev. Ic. Fil. t. 9, and I am well satisfied with that 
plant being the true pinnatum of Hedwig. Of Zr. Schomburg- 
kianum I possess the very specimens referred to by Sturm (Schom- 
burgk’s n. 299 and 1155); they exhibit no distinguishing cha- 
racters whatever. 
The species is doubtless variable. Our largest specimen is 
two and a half feet long, the terminal pinna is a foot long; the 
costa there runs out six inches (and more) and then bears a 
solitary pinna. An excurrent rachis instead of a terminal pinna 
is very common, and sometimes it throws out only roots, at other 
times young plants; in one case these young plants have no 
venules, while the parent frond has them sufficiently conspi- 
cuous. 
Puate 8. Caudex of Trichomanes pinnatum, Hedw., bearing two kinds of 
fronds, undivided and pinnated,—zad. size. Fig. 1. Portion of a pinna, with 
sori and spurious veins,—magnified. 2,3. Involucres, one laid open to show the 
attachment of the sorus to the columella,—more magnified. 
