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covered with minute sqnamules of lime; columella absent;
threads of the capillitium very slender (08, 3 g diam.), forming
a flaccid, very dense net; spores blackisb-brown, verruculose,
12, 5—13, 2 g diameter.
Ghondrioderma leptotrichum, Racib., Myx. Crac., p. 7, f 4;
Sacc., Syll, 1267.
Poland.
Removed from Ghondrioderma on account of the furfuraceous
and not porcelain-like wall of the sporangium.
Didymium Listeri, Mass. (figs. 97—101).
Plasmodium qndvina,to-compressed, in large, irregular, scattered
patches; outer wall white, with a thick layer of stellate crystals
of lime, rather fragile, breaking away in irregular patches;
inner wall very th in ; columella absent; eapillitium dense, threads
parallel, without free ends, often forming acute-angled dichotomies
and connected by transverse bars, dark brown, usually
branched near the paler tips that are attached to the wall;
spores globose, dingy lilac, minutely warted, 8—10 g diameter.
“ Didymium dubium, Rost.,” Lister in Herb., Kew.
On dead leaves. Britain (Lyme Regis).
The present species superficially resembles D. dubium, but is
quite distinct in the copiously anastomosing threals of tbe
capillitium which are entirely destitute of free, curved, spinelike
branches. Plasmodia 3—7 mm. across.
Didymium Tussulaginis, Mass.
Spiorangia sessile on a bn-oad base, hemispherical or irregular
and plasmodiocarp, wall thin, pinhish-grey, more or less iridescent,
toith minute, scattered crystals of lime, dehiscing irregularly
; capillitium well-developed, springing from tbe base of the
sporangium, threads repeatedly hranching in a diehotomous manner,
rarely anastomosing, with scattered, small swellings usually containing
one large or two to four small crystals of lime; spores
blach-broton in the mass, pale brown witb a lilac tinge by
transmitted light, globose, very minutely verructilose or quite
smooth, 12—14 g diameter.
Didymium Gookei, Raunk., Myx. Dan., p. 109, t. 5, f 5.
Physarum tussilaginis, B. and Br., Ann. Nat. Hist., n. 1597;
Cke., Myx. Brit., p. 16.
Ghondrioderma Gookei, Rost., Mon. App., p. 17.
Exsicc.—Cke., Fung. Brit., Ser. 1., 526 (as Badhamia eapsu-
lifer); Cke., Fung. Brit., Ser. IL. 206; Thum., Myo. Univ.,
1100; Vize. Mioro-fungi Brit., 1 and 101.
(Type in Herb., Kew.)
On the under surface of living leaves of oolts-foot, Tussilago
farfara. Britain (Cheshire); Denmark.
A very remarkable species, not agreeing in important points
witb any established genus, scattered or in groups of 2—4,
1'5—3 mm. across. Apparently quite normal in its development,
and not accompanied by any other species, it occurred
in abundance for several years in succession in Cheshire, and
has also been found in Denmark. In a note attached to the
specimens in tbe Kew Herbarium, Mr. A. Lister says, “ The
whole appearance conveys the impression that it may not be
a stable form, and the habit is so peculiar.” Of course it is
a matter of opinion as to whether tbe appearance described
above can afford any clue as to stability, but certainly many
species occur on living plants.
The presence of lime in tbe capillitium prevents the present
species from being a typical Didymium or Ghondrioderma; tbe
lime is too scanty and tlie capillitium too slender for a
Physarum.
Didymium anomalum, Mass.
Plasmodium venulose, arcuate or variously contorted, very
convex, surface minutely granulose; columella very strongly developed,
with a broad base resting on the substratum, arcuate,
following the shape of the plasmodiocarp; threads of capillitium
very delicate, thin, colourless, flaccid, forming a dense n et; spores
minutely verruculose, yellow, 11—13 g diameter,
Chandrioderma anomalum, Rost., Mon,, p. 160; Sacc., Syll,
1263.
Russia.