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D ID E R M A GLOBosuM.
Globose Diderma.
C l a s s a n d O r d e r CRYPTOGAMIA FUNGI, N a t . Om>. GASTROMYCI,
Link, Grev.
g e n e r ic c h a r a c t e r .
Sporangium suhglohosum. Peridium duplex ; exterius fragile,
peridium. Sporulce flamentis intermixtce.
Sporangium subglobose. Peridium double; the outer one fragile,
intermixed with filaments, and surrounding a columella.
Columella intra
Sporules
SPECIFIC CHARACTER.
D i d e rm a globosum; sessile, suhglohosum, l<Bve, candidmu; peridiis fragilis ;
tsportdis globosis.
D. sessile, roundish, smooth, w h ite ; the peridla fragile; the sporules globular.
D i d e rm a globosum, Pers. Disp. Fung. p. 9. t. 4. f. 4, 5.—Ejusd. Syn. Fung.
p. 167,—Alb. et Schwein. p .8.9.—Schwein. Syn. Fung. Carol. No. 365.—
Sturm’s Heutschl. FI. cum icone.—Hook. FI. Scot. 2. p. 12— Grev. FI. Edin.
p. 453.
H a b . On dead Beech and Oak leaves in autumn. Frequent.
Gregarious, sessile, minute, about a line in diameter, roundish, somewhat
depressed, white or greyish, the outer peridium fragile and evanescent in
farinaceous particles; the inner one also fragile, grey, membranaceous.
Columella large, white, roundish. Sporules globose, dark-coloured, intermixed
with filaments.
Considerable uncertainty exists about the generic character
of Diderma. P e b s o o n described under it plants with a single
and with a double peridium; some of which have a columella,
others none. I f iN K , who has constituted several new and excellent
genera of minute Gastromyci, has referred to Diderma
such species as possess a double peridium and no columella;
while his Didymium (to which our plant belongs) is provided
ivith a columella in addition to the two peridia. As the species
now figured is of more frequent occurrence than any other one of
VOL. I I I .
mm