. The vegetable kingdom : or, The structure, classification, and uses of plants, illustrated upon the natural system. are little excrescencesupon the roots, and the celebrated Ergot is producedby the action of a minute parasite. There is indeed adifficulty about such species as Sclerotium scutellatum ;but there is little doubt that, in the main, Leveillesobservations, even though from tlie nature of the sub-ject the proof is not rigorous, are fomided in supposed species of Uredo are merely the youngof Puccinia, Aregma, &c. ; but there are also truespecies of the genus. See Henslow, J
. The vegetable kingdom : or, The structure, classification, and uses of plants, illustrated upon the natural system. are little excrescencesupon the roots, and the celebrated Ergot is producedby the action of a minute parasite. There is indeed adifficulty about such species as Sclerotium scutellatum ;but there is little doubt that, in the main, Leveillesobservations, even though from tlie nature of the sub-ject the proof is not rigorous, are fomided in supposed species of Uredo are merely the youngof Puccinia, Aregma, &c. ; but there are also truespecies of the genus. See Henslow, Journ. of Roy. 1841, vol. ii. p. 2. KUtzing, in his Prize Essay on the Transformationof Plants, asserts that from one and the same oiganicmaterial, even when it has acquired form and colour, different vegetables may bedeveloped, which, according to the circumstance of the surrounding medium, areAlgals, Fungi, Lichens, or Mosses ; and that even the spores of these, when pro-Fig. XXIV.—Puccinia graminis (common Mildew), with its spawn or mycelium penetrating the cellof the plant on which it grows. d2. Fig. XXIV. 36 FUNGALES. [Tiialiogens duced, are capable of generating plants belonging to different Orders. This has beenlong a favoui*ite theory in Germany, bnt it has not been so fully developed VerhancleUngen van lie Holl. Maatsch. der Wetensch. fe Haarlem. TweedeVerz. 1. Beel. The subject, as regards the possible development of Algals, &c., from Infusoria,has been rehandled by the same author in a Memoir just pubUshed at who are not con^inced by his reasonings, will at least be ready to acknow-ledge the great research and patience with which they have been followed observations are entitled to the greater attention, because he is well acquaintedwith the various forms assumed by cellular plants, though his gieat work on Algalsscarcely shows him to have accurate notions as to the hmits of genera and species. The Fungi by which
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