Jamesoniane N. O. Filices. 
TAB. DCLVI. 
AcrosticuuM (EKLarxoeiossum) TamMBILLENSE. Hook, 
Caudice crasso descendente fibrilloso superne copiose squamoso, 
frondibus cespitosis subcoriaceis glabris nudiusculis, sterili- 
bus oblongo-ovatis tenui-acuminatis basi obtusis rarius 
oblique leviter decurrentibus, fertilibus 6-ties minoribus 
lanceolatis acutis, venis (utrinque) parallelis obsoletis internis, 
stipite frondes vix superante gracili nudo. 
Has. Sides of ravines, Tambillo, near Quito. Dr. W. Jameson. 
The caudex of this species resembles a true rhizoma, short, 
thick, woody, descending, scarcely oblique, clothed with abun- 
dant fibres, of which many are 2-4-inches long, branched, black 
and hairy; the top of the caudex is nearly an inch wide, and 
clothed with a dense mass of shining, dark brown, subulate 
scales, from which the stipites spring, several near each other in 
a cespitose manner. Sterile fronds 3-4 inches long, with a 
finely acuminated point, and a very obtuse base. The fertile 
fronds are many times smaller, lanceolate, acute, rather than 
acuminate, clothed beneath with pale, yellow brown capsules, 
the costa, and often a space on each side the costa bare. Seen 
under a microscope, the stipites sometimes, as well as the 
fronds beneath, exhibit minute, glandular, brown dots or scales, 
not visible to the naked eye. 
