202 SLossoN: ONE OF THE HYBRIDS IN DRYOPTERIS 
the same locality. It grows there on the outskirts of a deeply 
wooded sphagnum swamp, near plants of both D. Clintontana 
and D. marginalis. It may be described as follows : 
Dryopteris Clintoniana x marginalis hyb. nov. 
Rhizome stout, caudiciform or more or less Fe enDene ial a 
35-60 cm. long, 16-25 cm. broad, Sarco or Y elligtic 
acuminate ; pinnae, excepting the uppermost, short-stipitate, vary- 
ing from oblong- lanceolate to elliptic-lanceolate in the main part 
of the laminae to ovate-lanceolate at or near the base, mostly all 
long-acuminate, deeply pinnatifid or at base subpinnate, inequi- 
lateral, the inferior pinnulae the longest; pinnulae oblique, often 
subfalcate, oblong or ovate-oblong to lanceolate, obtuse or the 
longer often subacute to long-acute, the longest either at or near 
center or base of the pinna, few, usually the basal if any, con- 
stricted at base, obscurely notched or toothed or sparingly cre- 
nate-serrately toothed or lobed, the lobes often obscurely toothed ; 
sori about 3-7 (rarely 8 or 9) pairs, nearer midveins than margins 
or midway between, a few occasionally submarginal ; indusia 
glabrous. 
Type in the Underwood Fern Herbarium, New York Botanical 
Garden, J. Slosson, from Pittsford, Vermont, 1908. Collected 
also by R. C. Benedict at Cornwall, Connecticut, July, 1907, and 
June, 1909; by E. J. Winslow at Barton Landing, Vt., 1905; by 
E. Brainerd at Middlebury, Vt., 1908 and 1909; and by H. G. 
Rugg, at Dorset, Vt., 1909. 
The lack of resemblance of Dryopteris Clintoniana x margin- 
alis to D. Clintoniana may perhaps be best defined as its sugges- 
tiveness of D. marginalis in outline of lamina, pinnae, and pinnulae, 
a suggestiveness which D. C/intoniana lacks altogether. Notice- 
able points of distinction from Dryopteris Clintoniana are the greater 
proportional breadth of the hybrid’s leaf, its conspicuously attenuate 
apices, its color, nearer that of D. marginalis, the varying position 
of its sori, and its oblique often subfalcate pinnulae. 
From Dryopteris cristata x marginalis, D. Clintoniana x mar- 
ginalis may be most easily distinguished by the greater proportional 
breadth of the lower part of the lamina, coupled mostly with 
attenuate apices of all, even the basal, pinnae; by the position of 
