Gardneriane. N. QO. Filices. 
TAB. CDLX VIL. 
ADIANTUM CALCAREUM. Gardn. 
Frondibus pinnatis glabris, pinnis dissimilibus, superioribus 
dimidiatis subtriangularibus basi truncatis margine superiore 
incisis, inferioribus flabellatis profunde incisis, laciniis emar- 
ginatis basi acutis vel subcordatis, indusiis levibus, rachi 
glabra apice seepe nuda elongata radicante. 
Adiantum caleareum. Gardn. Herd. Bras. n. 3551. 
Has. In clefts of calcareous rocks near Natividade, province 
of Goyaz, Brazil. December, 1839. 
Frondes fasciculate. Stipes subpollicaris, atropurpureus, teres, 
nitidus, subpaleacens. Rachis teres, glabra, in apice frondis 
sepe nuda, elongata, extremitate demum radicante. rons 
4-6 pollicaris, pinnata. Pinne. fere semipollicares, alterne, 
brevissime petiolate, superiores dimidiate, subtriangulares, 
basi truncate, margine superiore incisz ; inferiores flabellate, 
profunde inciso-lobate, laciniis emarginatis, basi acute vel 
subcordate. Vene radiate, pluries furcate, venulis parallelis. 
Sori marginales, oblongi. Indusia oblonga, membranacea, 
glabra. 
This species of Adiantum comes near A. caudatum, Linn., 
but differs in being a much smaller plant, thinner in texture, 
and smooth. The pinnz are also shorter, broader, more deeply 
incised, and less recurved than they are in A. caudatum. The 
fronds of both species are occasionally radicant at their 
apices ; and sometimes the lower pinne in A. caudatum assume 
_ the rounded flabellate form, which in the present plant pores 
half-way up the rachis. G. Gardner. 
Fig. 1. Lower pinna. /f. 2. Sorus; the indusium laid open :— 
magnified. 
