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ii' í.
to form a dense net, with the angles usually triangular ; sjiores
dingy purple, globose, warted, 12—14 g diameter.
(Type in Herb. Berk., Kew., with Tilmadoche nutans.)
On bark. Ceylon.
Scattered, I'S—2 mm. high. Bearing a superficial resemblance
to Tilmadoche nutcms, but distinct in the capillitium,
wbicli contains no trace of lime, and in the spores.
Didymium zeylauicum, B. and Br.
Sporangium hemispherico-depressed, with a shallow umbilicus
below, wall thin, colourless, frosted with white granules of lime ;
stem elongated, attenuated upioards, or almost obsolete, Iroion
or yellow, longitudinally wrmkled, filled with small grains of
lime, expanding below into a spreading hypothallus ; capillitium
forming a dense irregular net, threads colourless, very thin;
spores dark purple, globose, very minutely verruculose, 7—0 g
diameter.
Didymium zeylanieum, B. and Br., in Journ. Linn. Soc., vol.
xiv., p. 84.
Ghondrioderma zeylanieum. Host., Mon. App,, p. 15 ; Sacc.,
Syll?, no. 1254.
Chondrioderma exiguum, Racib., Hedw., 1889, p. 118.
(Type in Herb. Berk., no. 10770.)
On decayed wood. Ceylon ; Poland.
The species described as Ghondriodexma exiguum cannot be
separated from tbe present species; the points of difference
given by Raciborski only apply to certain individuals which,
from an examination of the type, is a variable species.
Didymium obrusseum, B. and C.
Sporangium white or pale yellow, almost globose, sometimes
slightly umbilicate below, wall very thin, with little or no lime,
often iridescent when empty ; stem attenuated upwards, flattened
and distoi'ted helow, weak and drooping, bright yellow, expanding
at tbe base into a very thin, irregular hypothallus of the same
colour; columella absent; capillitium rather scanty, threads
thin, colourless, repeatedly forked and joined laterally to form
a loose, irregular n e t; spores globose, dingy lilac, very minutely
verruculose, 8—10 g diameter.
Didymium obrusseum, B. and C., Grev. (1873), vol. ii., p. 53.
Physarum obrusseum (B. and C.), Saco., Syll., 1195 (in part).
(Type in Herb., Kew.)
Exsicc.—Fung, Cubenses Wrightiani, 532.
On twigs, leaves, &c. Cuba; United States.
Gregarious, stem flaccid, irregular and flattened below, very
thin above, about 2 mm. long, hypothallus very thin and
shining.
Didymium pertusum. Berk.
Scattered. Sporangium globose or depressed, generally more
or less umbilicate, white, frosted with minute crystals of lime;
stem elongated, slightly attenuated upwards, rufous; columella
entirely absent; threads of capillitium very thin, colourless, variously
branched and combined to form a net; spores globose,
dirty lilac, verruculose, 10—13 g diameter,
Didymium pertusum. Berk., Eng. FL, vol. v., p. 313; Cooke,
Myx. Brit., p. 35; Sacc., Syll, 1317.
(Type in Herb. Berk.)
On dead herbaceous stems. Appin, N. B.
Scattered, varying from 2’5—3 mm. high. There is no trace
of a columella, although after dehiscence the basal persistent
portion of the sporangial wall falls down, and this under a
pocket-lens might be mistaken for a columella. The threads
of tbe capillitium anastomose freely and form a very irregular,
scanty network. The stem is more or less longitudinally
rugulose, and filled witb amorphous particles of lime.
Didymium eximium, Peck.
Sporangia subglobose, slightly or not at all umbilicate below,
grey, frosted with stellate crystals of lime; stem elongated, erect
or slightly curved above, almost equal, slender, pale yellowish-
brown. darker towards the base, which expands into a minute
hypothallus, slightly rugulose, filled with amorphous particles