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A very distinct species, sporangia 1'5—2 mm. high, scattered
singly or in groups of two or three. Most nearly related to
Fhysarum ruhiginosum, Fr., but readily distinguished by the
smaller spores, and the scattered stipitate sporangia. Readily
distinguished from the red form of Physarum ScJmmacheri, by
the absence of a columella and tbe pyriform sporangium passing
insensibly into the short stem.
Physarum atroruhrum, Peck.
Scattered or gregarious, stipitate; sporangia globose, even or
somewhat wrinkled, darh-red; stem cylindrical, even, blackish
or subconcolorous, capillitium when cleared of tbe spores
whitish, sometimes witb a slight pinkish tin g e ; columella none ;
spores globose, smooth, dark-brown in the mass, dark-red when
separated, -0003—'00035' in diameter ( = about 8—9 g).
Physarum atronibnmi. Peck, 31st Report, N. York State
Mus., p. 40; Saco., Syll., vii., 1, n. 1202 (as Physarum atro-
gmrpureum by mistake).
Decaying wood. Adirondack Mts., D. States.
The plants are scarcely one line high. The capillitium is
very delicate, and when cleared of tbe spores the knot-like
thickenings are seen to be very small and of a dark-red colour,
to which probably is due tbe pinkish tinge sometimes observed.
The dark-red granules of the sporangium walls are abundant,
and appear to form a continuous crust. (Peck.)
Physarum roseum, B. and Br.
Sporangia stipitate, globose, broadly elliptical or obovate,
dark reddish-purple, sporangial wall covered with a thin crust
of minute granules of lime; stem brownish-purple, equal,
longitudinally wrinkled, filled witb granules of lime, equal to
or usually longer than sporangium, expanding at the base into
a small, circular, pale brown, wrinkled hypothallus; capillitium
well developed, threads thin, tinged pink, with scattered,
elliptical, interstitial swellings containing lime, nodes not usually
enlarged or containing granules; spores globose, smooth, 10—11 g
diameter.
Physarum roseum. Berk, and Broome, Fungi of Ceylon, ii.,
n. 760, in Journ. Linn. Soc., vol. xiv., p. 84; Rost., Mon.
Append., p. 10; Sacc., Syll., vii., 1, n. 1194.
(Type in Herb. Berk., Kew.)
On grass, moss, bark, &o. Ceylon ; Paraguay.
Gregarious, 2'5—3 mm. high. Closely allied to Physarum
pulcherrimum, of which the present species may eventually
prove to be only a variety. The spores are generally smooth
under a xVH’ objective, but some show a minutely verruculose
surface.
Physarum ornatum, Peck.
Sporangia depressed or hemispherical, plane or slightly concave
beneath, greenish-cinereous, dotted with small yellow
granules, the empty walls whitish; stem short, black or hlackish-
In'oion, generally longitudinally wrinkled when d ry ; columella
none; capillitmm toith numerous, yellow, knot-lilee thickenings;
spores globose, smooth, violet-brown in the mass, '0004'—'0005'
in diameter ( = about 10—11 g).
Physarum ornatum, Peck, 31st Report of N. York State Mus.,
p. 40; Sacc., Syll., vii., 1, n. 1220.
Decaying wood. Albany, D. S.
Physarum Petersii, B. and C.
Gregarious, stipitate, sporangia globose, 'wall thin, yelloto,
with a thin sprinkling of minute particles of lime that soon
disappears; stem elongated, slender, subequal or slightly thicker
below, expanded at the base into a small, orbicular hypothallus,
reddish-brown, longitudinally wrinkled and filled with lime;
columella subglobose or shortly cylindrical, whitish; capillitium
rather dense, forming an irregular network, threads thin, with
scattered, elliptical, interstitial swellings containing yellow granules
o f lime, nodes rarely swollen; spores dirty lilac, smooth, 7—8 g
diameter.
Physarum Petersii, B. and C., Grev., vol. ii., p. 66; Rost.,
Mon., p. 116, Append., p. 6 ; Sacc., Syll, vii., 1, 1174.