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.
Uredo Potentillarum, DC. Potentilla Uredo; spots yellowish; sori subrotund and oval, bullate, aggregate, open, confluent; spores subglobose, subcoherent, orange.—On various Rosaceæ. Common.
Uredo Saxifragarum, DC. Saxifrage Uredo; spots pallid; sori subrotund and oval, raised, scattered and aggregate on the under surface; epidermis ruptured, persistent; spores subglobose, yellow.—On various Saxifrages.
Uredo Filicum, Desm. Fern Uredo; spots yellowish; sori subrotund, bullate, scattered and aggregate on the under surface; epidermis at length bursting; spores subglobose, yellow.—On Ferns (Cystopteris, &c.) Not common.