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202 MICROSCOPIC FUNGI.
C-ZSOMACEI.
Spores of gne order —
Tilletia >
Simple and free.
Without appendages,
Springing from delicate threads •
Produced —
in separate cells.
Very common. (Plate V. figs. 98, 99.)
Deeply seated, pulverulent,
generally nearly black . .
Superficial, yellow or brown
Ustilago.
Uredo.
l\ot inclosed in separate cells
Lecythea.
With appendages.
Deciduous
Permanent
Trichobasis.
Uromyces.
Compound.
Irregular
Polycystis.
Subglobose or shell-shaped
Tuburcinia.
—
Spores of two orders 1.
1.
1.
Spherical
Spherical
Concatenate, exposed . . . • I
2.
2. Cylindrical, septate
Wedge-shaped, compact
Spherical, concealed . . . . ji
Coleosporium.
Melampsora,
Cystopus.
TiLLETIA, Tul.
Spores spherical, reticulated, proceeding from delicate branched
threads.
Tilletia caries, Tul. Bunt; included within the germen;
sjjores spherical, rather large, black.—On wheat, filling the grains
with dark-coloured spores, fetid when crushed. Autumn. Very
common. (Plate V. figs. 84— 91.)
UsTiLAGO, Link.
Plant deeply seated. Spores simple, springing from delicate
threads, or in closely-packed cells, ultimately
into a —
powdery mass. Berk. Outl., p. 335.
breaking up
Ustilago segetum, Ditm. Corn Smut ; produced on the
receptacle and rachis ; epidermis soon ruptui'ed ; spores loose,
—
minute, globose, black. On the ears of corn and grasses. Autumn.