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threads of capillitium hyaline, here and there with irregular
swellings containing lime, internodes long, slender, some of the
nodes empty; spores globose or angularly subglobose, 11—13 g
diameter, blackish-violet, minutely mrrucnlose.
Physarum nefroideum, Rost., Mon., p. 93, figs. 80—82; Cke.,
Brit. Myx., figs. 80—82.
Physarum eompressum, Sacc., Syll., vii., 1, n. 1167.
On leaves, rotten wood, &c. Britain (Lyndhurst, New
Forest); Germany; Italy.
Closely allied to P. Phillipsii, but differing in tbe structure
of the capillitium, the nodes containing lime are much smaller,
the internodes long and slender, and many of the nodes are
empty and collapsed, or contain air only and not lime.
Physarum candidum, Rost.
Sporangia strictly or irregularly globose, sessile or stipitate,
dehiscing irregularly, wall charged witb lime, snow-white; stem
lohite, elongated,plicate, 1 mm. high, rigid, crustaceous, capillitium
with snoto-white rcmndish nodes containing lime; spores pale
violet, murieate, 12—15 g diameter.
Physarmn candidum, Rost., Mon., p. 96; Saco., Syll., vii., 1,
n. 1170.
On rotten wood. Juan Fernandez.
Physarum simile, Rost.
Gregarious, stipitate, sporangia globose, grey, densely covered
with small white lumps of lime, rigid; stem usually twice as
long as sporangium, equal, or slightly thickened below, and
passing into a small, orbicular hypothallus, yellowish, sometimes
witb a pink tinge, rigid, filled with particles of lime, usually
longitudinally wrinkled; columella subcylindrical, whitish, one-
fourth the height of tbe sporangium or less; capillitium dense,
threads thin, colourless, forming an irregular network, swellings
of nodes or interstitial parts small, elliptical or triangular, with
colourless or yellowish granules of lime; spores dingy lilac, very
mimdtd verruculose, 7—8 g diameter.
Physarum simile, Rost., Mon. Append., p. 6 (species founded
by Rostafinski on a specimen iu Herb. Berk.); Saoc., Syll,, vii.,
1, n, 1175.
Physarum Petersii, var. Farlcnoii, Rost,, Mon. Append., p. 6
(specimen named by Rostafinski in Herb. Berk.).
Exsiee.—Ellis, N. Amer. Fung., n. 1120.
On wood, moss, &o. United States.
Closely resembling P. Petersii, differing in the grey sporangium.
About 1.5 mm. high.
Physarum leucopus, Rost. (figs. 60—62).
Sporangia globose, broadly ellipsoid or a little depressed,
stipitate or sessile, rarely elongated and flexuous or anastomosing,
wall at first covered with a continuous, snow-iohite coat of
lime, lohieh soon becomes broleen up into smooth, innate patches;
stem variable in length, white, containing lime, straight, brittle,
slightly thinner upwards, longitudinally rugose, passing into a
more or less evident hypothallus; columella absent; capillitium
strongly developed, snow-white, with mcmeroiis large, irregularly
branched knots, containing lime in small granules; spores
globose, dingy lilac, rather coarsely warted, warts almost black,
9—12 g diameter.
/ . stipitatum. Stem present, length variable, in tbe typical
form, equal to, or longer than, the sporangium.
f . sessile. Stem very short or entirely absent, when the
sporangia are sessile on a broad base, sometimes confluent,
elongated, sinuous, or anastomosing irregularly.
Physarum leucopus, Rost,, Mon., p. 101; Cke., Myx. Brit., 12;
Schroeter, p. 129; Karsten, Myo. Fen., p. 102; Sacc., Syll.,
vol. vii., pt. I., n. 1188.
Physanm letoeophaeum, y. flexiwsum, Cooke, Myx. Brit., p. 15.
Exsiee.—Rab., Fung. Eur., 335 (as Physarum albipes); Cooke,
Eung. Brit., Ed. II., 619.
On wood, moss, &c. Britain (Highgate, Carlisle); Germany;
Finland ; Sweden; S. Africa; S. America; Ceylon; Australia.
A somewhat rare species, often represented in Herbaria by