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Species of Uromyces, Puccinia, etc., in the Uredo state have the spots powdery with spores; Aecidia show the characteristic "cluster cups," and so forth.

Uredo, ū-rē′dō, n. a form-genus or stage of fungi of order Uredine�.—adjs.

In the Uredines proper the germination seems to be somewhat similar, or at least not offering sufficient differences to warrant special reference in Uredo, Trichobasis, Lecythea, &c.

The new resultant mycelium reproduces the Uredo, or fifth form of fructification, and the Uredo spores fall off like those of the Æcidium, and in respect of germination, and mode of penetration, present precisely the same phenomena.

Up to the present we know that there are species of Trichobasis which have never been traced to association with a Puccinia, and doubtless there will be species of Puccinia for which no corresponding Uredo or Trichobasis can be found.