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to the typical form, but Rostafinski has given as forms of this
species a heterogeneous collection, varying considerably in habit,
colour, and size of spores, but all agreeing in having a columella;
bow many of these forms are British I do not know,
g. chn/sopus, which appears to be the same as Physarum citrinum,
Sebum., has been collected in Yorkshire, and a specimen
probably corresponding to y. aurantiacum has been met with
at Neatisbead.
The following are Rostafinski’s forms.
Var. a. genuinum. Sporangium yellow or greemsh-yellow,
i mm. wide, stem yellow; spores 7—8 g diameter; granules of
lime yellow. This variety is the one described above as the
type form.
¡3. chrysopus. Sporangium 1 mm. diameter, with the stem
golden-yellow; spores 10 g diameter; granules of lime golden-
yellow.
y. aurantiacum. Sporangia 4 mm. diameter; stem brown;
spores orange, 11 g diameter; granules of lime brown.
8. rufipes. Sporangium yellow or orange, sometimes iridescent;
stem orange-red; granules of lime yellowish.
e. compactum. Plasmodiocarp veinlike, creeping, short, yellow
or golden; columella absent, disappearing with the stem.
Piclymium melleum, B. and C., given as a synonym of tbe
present species by Rostafinski, although a Physarum, is quite
distinct, as shown by an examination of tbe type specimen in
the Berkeley collection in the Kew Herbarium.
(Rostafinski’s Synonyms.)
Physancm citrinum, Schum., Saell., i., 436 (1803).
Physanim aurantiacum, f rufipes, A. and S., Cons., 262 (1805),
Physarum mrrucosum. Link, Herb.
Physarum compactum, Ehr., Syl. Ber., p. 21 (1818).
Physarum Sehumacheri, Spr., Syst., iv., p. 528 (1827).
Diderma citrinum, Fr„ S, M„ iii., 100 (1829); Cooke, Hdbk.,
n. 1107.
Diderma rufipes, Fr., S. M., iii., 101.
Diderma compactum, Wallr., Herb.
Physarum aureum, ¡3. chrysopus. Lev., Ann. Sc. Nat. (1846),
p. 166.
Physanim fiavum, Fckl, Syn., p. 343 (1869).
Didymium melleum, B. and C., Ceyl. Fung,, 751.
Didymium ehrysopeplum, B. and Br., N. A. Fung., 348.
Physarum virescens, Ditm.
Sporangia stipitate, sessile and crowded, an irregular plasmodiocarp,
or an effused aethalium, wall rough, yellow, with
green or olive tints, stem when present yellow, wrmkled, equal
to or shorter than the sporangium; columella absent; capillitium
scanty, knots of lime few, small; spores globose, dingy
lilac, very minutely verruculose, 7—9 g diameter.
Physanimvireseens, Ditm., in Sturm, t. 61; Eost,, Mon., p. 108;
Cooke, Brit. Myx., p. 13; Sacc., Syll, n. 1183; Schroeter, p. 128.
Physarum thejoteum, Fr,, Gast., p. 21.
Physarum Ditmari, Rost., Mon. Append., p. 13.
Didymium croeeo-filavkim, B. and Br., Fung. Ceylon, n. 757.
Exsiee.—Fckl, F. Rhen,, 1460 (as Fhysarum anceps, de By).
a. genuinum: Sporangia sessile on a broad base, crowded,
rarely scattered.
/3. stipitatum. Sporangia stipitate, stem stout, longitudinally
wrinkled, yellow.
y. confluens. Sporangia sessile, plasmodiocarp or confluent,
and forming a cake-like aethalium.
On leaves, moss, &c. Biitain (Chiselhurst, Bristol, N. Wales,
Carlisle); Sweden; Germany; Madras; Ceylon; United States.
Usually sessile and crowded, sporangia subangular from
mutual pressure, varying from clear yellow through olive to
greenish-yellow, the last being most frequent, and with the
scanty capillitium with very few small knots containing lime,
marks the species in all its forms.
(Rostafinski’s Synonyms.)
Physarum virescens, Ditm,, t. 61 (1817).
Physarum thejoteum, Fr., Gast., p. 31 (1818).