TAB. LXIIL 
Trichomanes cellulosum, Kl. 
Caudice mediocri ascendente vel longe repente _ rigidissime 
fibroso-radiculoso, stipitibus sparsis approximate 2-4 unci- 
aJibus supcrne alatis firrnis atris, frondibus 2-4 uncias lon- 
gis rigidis atro-viridibus laxe cellulosis (areolis subrotundis) 
tri-4-pinnatis seu potius pinnatifidis, laciniis copiosis subpa- 
tentibus linearibus seu subspathulatis obtusis integerrirnis, 
costa centrali crassa rigida, soris copiosis marginalibus lacinias 
breves terminantibus, involucro brevi-cylindraceo marginato 
ore paululum dilatato integro, collumella elongata longe ex- 
serto crasso. 
Trichomanes cellulosum, Kl. in Linnaa , 18, p. 531. Kze. in 
Bot. Zeit. 5, p. 418. J. W. Sturm, in Mart. FI. Bras. 23, 
p. 269, t. 18, f. 13, Van den Bosch, Syn. Hymenoph, p. 25. 
Tr. filiforme, J. W. Sturm, in Mart. 1. c. p. 269, t. 18, f. 14? 
(The two figures in Martius are represented in “ nature- 
printing, ” excluding the caudex, and give no idea of the 
fructification or of the nature of the frond). 
Hab. Tropical America; Roraima, British Guiana, Bolt. 
Schomburgh, and Kunnuku Mountains, Rich. Scliomburgk, n. 
1184 ; Valley of the Amazon ; Bana of Rio Negro and San 
Carlos, N. Brazil, R. Spruce, n. 1399, 2278 (n. 873, accord- 
ing to Sturm,) and n. 2838, segments of the fronds a little 
broader and more opaque. 
Few who have not studied the numerous individuals of the 
family of Hymenophyllacece , can have an idea of the difficulty 
that attends their correct discrimination. Happily Dr. van den 
Bosch, for some time distinguished by his valuable writings 
on the Mosses of the Netherlands possessions in the Malay 
Archipelago, has taken up this beautiful group of Ferns, with 
an amount of knowledge and of zeal which augurs well for the 
Monograph, and many of the species are to be illustrated by 
figures. The present species seems to be peculiar to B. Gui 
ana and to the valley of the Amazon ; and judging by the 
references to Spruce’s specimens, T. filiforme of J. W. Sturm 
in Martius is only a var. of it. 
Tab. LXHI. Exhibits a plant of Trichomanes celhdosum, 
Kl. ; — nat. size. f. 1. Portion of a pinna with fructification. 
f. 2. Involucre laid open to show the capsules at the base of 
the columnar receptacle ; — magnified. 
Cent. 2. t. 63. 
