Simple and free. Without appendages, Springing from delicate threads. _Tilletia_. Produced in separate cells.— Deeply seated, pulverulent, } _Ustilago_ generally nearly black } Superficial, yellow or brown _Uredo_. Not enclosed in separate cells _Lecythea_. With appendages, Deciduous _Trichobasis_. Permanent _Uromyces_. Compound. Irregular _Polycystis_. Subglobose or shell-shaped _Tuburcinia_. Spores of two orders— 1. Spherical } _Coleosporium_. 2. Cylindrical, septate } 1. Spherical } _Melampsora_. 2. Wedge-shaped, compact } 1. Concatenate, exposed } _Cystopus_. 2. Spherical, concealed } TILLETIA, _Tul._ Spores spherical, reticulated, proceeding from delicate branched threads. =Tilletia caries=, Tul. BUNT; included within the germen; spores 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 breaking up into a powdery mass.—_Berk. Outl._, p. 335. _Ustilago segetum_, Ditm. CORN SMUT; produced on the receptacle and rachis; epidermis soon ruptured; spores loose, minute, globose, black.—On the ears of corn and grasses. Autumn. Very common. (Plate V. figs. 98, 99.) =Ustilago urceolorum=, Tul. SEDGE SMUT; produced on the glumes and utricles; epidermis soon bursting; spores in a compact mass, afterwards breaking up, globose, rather large, granulated.—Surrounding the seed of various _Carices_; as, _Carex prœcox_, _stellulata_, _recurva_, and _pseudo-cyperus_. Autumn. Not uncommon. (Plate VI. figs. 109-111.) =Ustilago longissima=, Tul. ELONGATED SMUT; produced on the leaves in linear, long, parallel, dirty-olive patches; epidermis bursting longitudinally; spores globose, breaking up into minute granules, olive-black.—On leaves of _Poa aquatica_ and _fluitans_. Summer. Common. (Plate V. figs. 105-107.) =Ustilago olivacea=, Tul. OLIVE SMUT; infesting the enlarged receptacle; epidermis soon bursting; spores olive-green, powdery, minute, mixed with filaments.—On _Carex riparia_. Not common. (Plate VI. figs. 126, 127.) =Ustilago hypodytes=, Fr. GRASS-CULM SMUT; produced on the culms beneath the sheaths, afterwards exposed; spores minute, subglobose, brownish-black.—On the culms of various Grasses. Summer. Sometimes not uncommon. (Plate V. figs. 100, 101.)