Diphasiastrum tristachyum (Pursh) Holub

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NEW YORK BOTANICAL GARDEN
03505290
DESERT ISLAND, MAINE. ^jfe
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THE NEW YORK BOTANICAL GARDEN
HERBARIUM OF LUCIEN M. UNDERWOOD
PURCHA8ED 1908
Lycopodium chamaecyparissus A. Br.
Rhizomes extensively creeping about 4 cm. below the surface :
of the ground, occasionally forced by obstructions to grow up-
ward, but turning down again when the obstruction is passed; in
color white, terete, sparingly branched in the horizontal plane*.
their whorled or loosely spirally arranged leaves lanceolate or
ovate to broadly ovate (1-2 mm. broad), usually the latter, and then
I scarious, abruptly contracted into a narrow base, acute, their mar-
gins membranous and erose; the primary aerial shoots weak, terete,
usually sinuously bent and often becoming decumbent under the
weight of the superadded foliage, the axis repeatedly forking until it
forms a mass of more or less vertically placed somewhat flattened
branchlets which are plano-convex in transverse section, 1.5-2 mm.
broad (concave beneath on drying) j the terminal branchlets regu-
larly producing more or less orthotropic innovations the second and
sometimes the third season, the lower and therefore older foliage i
branches ultimately spreading and becoming lax, some of the
i medially placed branches remaining short, thicker, terete, strictly
vertical, and producing either additional foliage parts or ultimately
running up into strobile-bearing peduncles : leaves of the primary
aerial axis in 6-8 rows, those at the base of the shoot similar to
those of the rhizome, appressed, passing higher up the axis from
oivate through lanceolate-acute into the acuminate form; those of
the Subterminal and terminal branchlets in four rows, an upper, an
under and two lateral, glaucous, bluish green, acuminate, ap-
pressed, those of the under row differing scarcely at all from those
of the other three rows, the leaves of the lateral rows somewhat ;
incurved underneath, all becoming shorter and more crowded j
towards the end of the season’s growth : peduncles terete, glaucous, j
50-60 mm. long to the first forking, usually twice forked, the '
second 8—13 mm. distant from the. first, spreading and curving up-
ward, the leaves on the peduncle and its* branches spirally
scattered or less commonly loosely segregated into whorls of
i threes, spreading-acuminate, scarious-tipped ; strobiles, two, three
or usually four, 20-25 mm. long, the sporophylls broadly de-
i pressed ovate, truncate at the base, the lateral margins variously
toothed, suddenly contracted into a subulate scarious tip;
sporangium reniform, opening by a transverse slit along the top;
spores deep yellow in mass, regularly areolate on the convex.,
face, the areolae , on the triangular inner faces becoming larger,
more irregular and fading away so as to leave a triangular smooth
j area in the internal angle, ripening e|rly in August.-^,,
03505290