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Bidymimn lobatum, p. stipitatum, Somm., FI. Lapp., 210
(1825).
Bidymium nigripes, Fr., S. M., iii., 119 (1829); Eng. FL, v.,
313; Cooke, Hdbk., No. 1124.
Didymmm xanthopus, Fr., S. M., iii., 120 (1829); Berk., Ann.
N. H., iii.; Cooke, Hdbk., No. 1126.
Didymium iridis, Fr., S. M., iii., 120 (1829).
Didymium microcephalum, Chev., Byss., £ 1 1 (183/).
Didymium melanopus, Wallr., FL Germ., 2184 (1837).
Didymium Wallrothii, Eabb., FL Cr., 2289 (1844).
Didymium porphyropus, D. R. and M., FL Alg., 409 (1846).
Didymium megalosporum, B. and C., Grev., No. 318.
Didymium macrospermum, Rost.
Sporangia spherical or hemispherical, very much flattened
vertically, umbilicate below, grey, stipitate, membrane of sporangium
colourless or pale brownisb; stem generally longer
than peridium, dilated at the base into a distinct discoid
hypothallus, attenuated above, strongly plicate longitudinally,
sno'w-white or yelloiDish-zvhite; columella versiform, discoid, &c.,
threads of capillitium simple, rarely branching at acute angles,
colourless or pale brown; spores subviolaceous, strongly aculeate,
12—13 g diameter.
Didymium macrosqoermum, Rost., Mon., p. 166; Schroeter,
p. 122; Sacc., Syll., n. 1304.
On trunks. Germany.
Gregarious; stem three or more times longer than the
sporangium, thinner above, much wrmkled, ridges membranaceous,
pellucid, peridium thin, sometimes dehiscing by becoming
ruptured at the base, and almost all disappearing; at
other times torn into shreds which persist. Appears to be
allied to Didymium squamulosum, var. eostatum, and distinguished
by tbe flattened sporangium, long stem, and larger
spores.
(Rostafinski’s Synonyms.)
(?) Trichia alata, Trent., 1. o,, p. 228 (1797).
(?) Physarum alatum, Fr., 1. o., iii., p. 132 (1829).
Didymium eostatum, Fckl, Sym. Myc. I., Nach., p. 339.
Didymium discoideum, Rost.
Sporangia discoid, almost sessile, umbilicate, inferior part of
wall violet, superior spotted, with irregular pellucid veins,
breaking away after maturity in small patches; stem from its
shm-tness scarcely apparent, hid in the umbilicus, dilated at the
base into a circular hypothallus; columella discoid or hemispherical,
like tbe stem yellowish flesh-colaur; threads of capillitium
flexuous, rarely forking, bay, tips colourless; spores
strongly warted, blackish-violet, 11—13 g diameter.
Didymium discoideum, Rost,, Mon., p. 162; Sacc., Syll., no.
1305.
Germany.
* * Spores smooth.
Didymium radiatum, B. and C. (figs. 68—72).
Scattered, sporangia vertically compressed, not umbilicate, but
sometimes slightly depressed below, dark grey, witb crowded,
small, white, innate patches of lime, dehiscing irregularly;
stem longer than height of sporangium, slightly attenuated
upwards, white or pale grey, expanding into a small, circular
hypothallus, longitudinally costate, the ribs passing in a radiate
manner into the hypothallus; columella brownish, much compressed
; capillitium abundant, radiating from the columella to
tbe wall of the sporangium, threads thin, brownish-lilac, sometimes
forked; spores globose, lilac, smooth, 8—10 g diameter.
Didymium radiatum, B. and C., Journ. Linn, Soc., vol. x..
p. 348; Sacc., Syll., n. 1328.
(Type in Herb. Berk,, Kew, no. 10705.)
Didymium commtitabile, B. and Br., Journ. Linn. Soc,, v. xiv,,
p. 83; Sacc., Syll., n. 1300; Rost., App., p. 21.
(Type in Herb. Berk., n, 10766.)
Didymium hotryoides, Berk, in Herb.
f . genuinum. Simple, scattered; stem usually longer than
sporangium.