Diphasiastrum digitatum (A.Braun) Holub

EXAMINED for the
NEW YORK PTER1DOFLORA
BY MICKEL BEITEU
*.ND WAGNER 1989-1990
THE NEW YORK BOTANICAL GARDEN
HERBARIUM OF LUCIEN M. UNDERWOOD
PURCHA8ED 1803
HERB. LUCIEN M. UNDERWOOD.
0 £>¿444*+**%,
/ft 7
CL,	Coll. bmàÎK&r	*Éf
03504922
TLMfATUM L.
Rhizomesrex|liiPibljPbrle]fii!^aII^®:iie surface of the ground,
exposed or in moss, etc., usually gre^Bfiattened above, furrowed I
j on' the flattened surface, sparingly inching in the horizontal
plane, spirally arranged or sometimes I® ply segregated in whorls :
theiV leaves acuminate, spreading, scajKis-tipped, the lateral ones
curving upward ; primary aerial shoJK strong, flattened and fur-
I rowed on one side, the branches conv^fon the upper side, concave
below (1.8-2.5 mm. broad), spreading out into a horizontal plane,
the medially placed branches more nearly terete, and either pro-
ducing additional foliage-bearing shoots or, ultimately, sporangium-
bearing peduncles : leaves of the vertical axes spirally placed or
? in loose whqrls, spreading, acuminate, scarious-tipped, the several
[ (5-8) rows being reduced to four on the foliage branches ; the
• leaves of the upper and lateral rows, which are separated as by a
continuous furrow, cuspidate, with spreading apices, bright greea,
I those of the under row reduced to slender, curved, spreading, cuspi-
I date apices, the under side of the branehlets thus appearing devoid I
j of foliage, lighter in color and concave; all the leaves decreasing I
j gradually in size from the base to the tips of the branches : pedun-
j cles (5-7-5 cm. long up to the forking) terete, a little stouter thaji '
j in L. chamaecyparissus, furrowed, forking usually twice, the first and ?
I second forks 2—5 mm. distant from each other: pedicels straight,
j 5-8 mm. (mostly 7-8 mm. long), bearing strobiles 15—25 mm*
| long: leaves of the peduncles and pedicels scattered or loosely
> whorled in threes, acuminate, scarious-tipped, Spreading; sporo*
j>h /11s .fcroadly ovate, more or less toothed on the lateral margins,
contracted gradually into a scarious apex : sporangia reniform,
, opening by a transverse slit: spores reticulate on the four faces,
ripening late in August and in September.	, I