258 
The spores vary a great deal according to the stage of develop- 
ment, as seen in the figures, which accounts for the discrepencies 
in the descriptions. 
There has been no opportunity of comparing this species with 
Alternaria chartarum Preuss; (Sacc. Syll. 4: 546,) consequently 
the above binomial has been used. 
Careful comparisons have been made with Ellis & Everhart’s 
- Fungi Columb. 396, Macrosporium chartarum and 399, M. fascicu- 
latum. 
Two new Bolivian Ferns of the Miguel Bang Collection, 
By B. D. GILBErr. 
There are about fifty species of ferns belonging to the Miguel 
Bang collection yet to be published. All of them, however, be- 
long to well established and recognized species except the two 
described below. The only other genus of the collection contain- 
ing especially desirable species is Acrostichum, which is particu- 
larly strong; and while the specimens do not always contain 
fruited fronds, they are of such a character that little doubt can 
be entertained in regard to the identity of the species. 
The new species and variety are as follows: 
BLECHNUM NIGRO-SQUAMATUM nf. sp. 
Stipes 1 ft. long, stout, 1% in. diameter, furrowed, thickly 
clothed for 6 in. from base with narrow lanceolate acuminate black 
scales 1%4—34 in. long ; rachis strong, stramineous, naked, deeply 
channeled on upper side, with a wing on each edge in upper 34 
of frond connecting the pinnae; frond 4-414 ft. long, 1 ft. broad 
in center, fully pinnate in lower quarter, tapering rather abruptly 
upward and moderately downward; pinnae numerous, 6-7 in. 
long in middle of frond, %4~—5¢ in. wide, dilated on both sides at 
base and slightly connected except in lower quarter; lower pin- 
nae 2 in. apart, reduced to 2 in. long, but broader in comparison, 
blunt but not rounded at tip, mid-pinnae about same. width 
throughout until within 1-14, in. from tip, where they decrease 
and become acute; edge finely serrate and wavy; texture cori- 
aceous, both surfaces naked; costae stramineous, conspicuous ; 
veins distinct, simple and occasionally forked ; sori extending 
from near the base of costa on each side, to about 1 in. from tip 
