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stem, wall dark grey, at first with granules of lime; eolumellci
irregular, more oi- less con fluent and ccmimon to all the sporangia;
threads of capillitium 2—3 g tliick at base, with but few
bifurcations, -loith numerous fusifoi'm or discoid dingy purple
thickenings, spores globose, brownish purple, ivarted, 12—14 g
diameter.
Didymium physarioides, Rost., Mon., p. 158, fig. 147; Cooke,
Myx. Brit., p. 33, f. 147; Sacc., Syll, no. 1311.
On moss and wood. Britain (King’s Cliffe, Carlisle); Germany;
Sweden; United States; Cape of Good Hope.
Often superficially resembling Physarum didermoides.
Didymium serpula, Fr, (figs. 55—57).
Sporangia sessile on a hroad base, much adpressed, circular in
outline, or variously elongated and flexuous, and sometimes tbe
branches combine to form an irregular network, ivall dark grey,
sparingly sprinkled with minute white particles of lime ; columella
absent; mass of spores blackish ; threads of capillitium branched
and connected laterally, forming an irregular network, dirty
brown to colourless, plentifully furnished with dark-coloured,
riug-like, or irregularly-shaped thickenings; spores globose,
very minutely verruculose, 7—9 g diameter.
Didymium serpula, Rost., Mon. Append.; Cooke, Hdbk., 30,
figs. 166, 180; Schroeter, p. 121; Sacc., Syll, no. 1297.
Didymium eamplanatum, Rost., Mon., p. 151, figs. 166, 180.
On leaves, &c. Sporangia when circular '5— 1 mm. diameter ;
wben elongated often several mm. in length. .Sometimes the
lime on the sporangium is more abundant, forming a white
crust; but the species cannot be mistaken if attention is paid
to the much flattened sporangia, the well-developed capitulum
having tbe threads furnished with numerous, variously-shaped,
dark brown thickenings, and the very minutely verruculose
spores.
Bj-itain (Kew, Batheaston, Scarboro’, Carlisle); all Europe;
United States.
(Rostafinski’s Synonyms.)
Dycoperdon complanatum, Batsch, t. 170 (1786).
Didymium serpula, Fr., S. M., iii., 126 (1829); Eng. FI., v.,
314 ; B. and Br., Ann. N. H., No. 1035 ; Cke., Hdbk.,
n. 1134.
Physarum confuens, Fckl., Symb. Myc., p. 342 (1869), non
Pers.
Didymium confluens, Rost.
Sporangia sessile, sometimes scattered and then hemispherical,
at others densely crowded on a well-developed hypothallus,
hemispherical reniform, or irregularly angular from mutual
pressure ; columella distinct, yellowish, or with a pink tinge ;
threads of capillitium very slender, forked at acute angles, pale
brownish-lilac'; spores globose, rather coarsely warted, dingy
purple-brown, 10—15 g diameter.
Didymium confluens, Rost., Mon., p. 164.
Didymmm crustaceum, Sacc., Syll., no. 1303.
On leaves, wood, &c. Britain (Castle Howard, Yorks);
France; Italy; Russia; Finland.
(Eostafinski’s Synonyms.)
Didymium complanatum, Schrad., Nov. Plen. Gen., p. 24, t. 5,
f 3 (1797).
Physarum confluens, Pers. Syn., p. 169, et v., a truncigerum
(1801).
Physarum confluens, ¡3 muscigcnum, A. et Sz., 1. c., p. 9 (1805).
Didymium crustaceum, F,, 1. c., iii., p. 124; Excl. Syn. (1829).
Gionium complanatum, Lk. ap. Wallr., 1. c., no. 2176 (1833).
Var. ohducens, Karst., Not. Sallsk., pro. faun, et flor. Fenn.,
ix., p. 356 (1880).
Sporangia irregular (plasmodiocarp), flattened, often umbili-
cate, concave below, solitary or gregarious, sometimes densely
crowded ; stem short or almost obsolete, irregular, broadening-
out below into tbe common liypotballus. Remainder as iu
type.
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