=Ustilago Maydis=, Corda. MAIZE SMUT; produced on the stems, germens, &c.; epidermis at length bursting; spores spherical, minute, brownish-black, surface covered with echinulate warts.—On stems, &c., of _Zea mays_. (Plate V. fig. 108.) =Ustilago Montagnei=, Tul. BEAKSEDGE SMUT; produced on the seeds; epidermis bursting; spores slightly angular, small, dark-coloured, intermixed sparingly with fragile filaments.—On seeds of _Rhyncospora alba_. Not common. (Plate V. figs. 96, 97.) =Ustilago typhoides=, B. and Br. REED SMUT; prodded on the stems of reeds, forming thick bullate patches several inches long, occupying whole internodes, covered by their sheath; spores globose, rather large.—On stems of _Arundo phragmitis_. Autumn. Not uncommon. (Plate VI. figs. 128, 129.) =Ustilago Salveii=, B. and Br. COCKSFOOT SMUT; produced on the leaves, forming elongated parallel sori on the upper surface; spores obovate, rather large, rough with minute granules.—On leaves of _Dactylis glomerata_ and other Grasses. Not common. (Plate VI. figs. 117-119.) =Ustilago grammica=, B. and Br. BANDED SMUT; forming little transverse bands consisting of short parallel black lines, 1/12 of an inch or more in length; spores globose, very minute.—On stems of _Aira aquatica_ and _A. cæspitosa_. Uncommon. (Plate VI. figs. 120-122.) =Ustilago vinosa=, Tul. OXYRIA SMUT; produced on the swollen receptacles; spores roundish, very small, and minutely papillose, separately pellucid, in clusters, violaceous.—On the receptacles of _Oxyria reniformis_. Uncommon. =Ustilago utriculosa=, Tul. UTRICLE SMUT; produced in the germen and perigonium; epidermis soon ruptured; spores effuse, minute, globose, purple-black.—On _Polygonum hydropiper_ and other _Polygona_. Autumn. Not uncommon. (Plate VI. figs. 112-116.) =Ustilago flosculorum=, Fr. FLORET SMUT; produced within the florets; spores minute, purplish-brown.—On the florets of _Scabiosa arvensis_. Not common. (Plate VI. figs. 123-125.) =Ustilago receptaculorum=, Fr. GOATSBEARD SMUT; produced within the receptacles; spores ovate, minute, reticulated, violet-brown, nearly black, very profuse, filling the receptacle.—On the receptacles of Goatsbeard. June, July. Common. (Plate V. figs. 92-95.) =Ustilago antherarum=, Fr. ANTHER SMUT; produced on the anthers and germens; spores subglobose, effuse, violet.—On the anthers of _Silene inflata_, &c. (Plate V. figs. 102-104.) UREDO, _Lév._ _Stroma_ composed of little irregular cells forming a lentiform disk, whose surface is covered with many layers of cells, each of which encloses a spore; _spores_ simple, always without any appendage.—_Berk. Outl._, p. 331. ------- * _Spores more or less yellow._