TAB. CXXXIX.
UREDO longissima.
Poa Aquatica, very plentiful in one part of Lambeth Marsh, bears this paralite on the foliage early in autumn, which gives the appearance of the fructification of an Asplenhim. It seems nearly allied to R. segetum of Bull. Pl. 472. fig. 2. (viz.) the smut,as it is commonly called, of the corn; but this fine dust is brown, and imbedded in longitudinal streaks in the substance of the foliage, covered by the epidermis, which it bursts on the front, and is visible by being transparent at the back. The smut seems a change of the substance of the feed, covered by its epidermis, and is much blacker. See Ustulata in Bibliotheca Banksiana, vol. 3. p. 422, and 431. The French call it Ergot. Uredo is a new genus of Persoon, in his work on Fungi.
TAB. CLX.
UREDO frumenti.
Much too common on wheat in low places, or where too closely sown, especially after rain in the early part of autumn. This takes possession of the foliage like the last, but rather in shape of upright short clavated threads, black at the top, appearing scorched at the bases, in shorter spaces, and frequently burst on both sides. It also more commonly covers the upper and outer parts of the stem, calyx, &c. for near two feet, seldom touching the feed, although it may stint it more or less by weakening the plant. This is commonly distinguished by the appellation of the blight.
