Medical and economical botany / by John Lindley.

Date:
1849
Catalogue details

Licence: Public Domain Mark

Credit: Medical and economical botany / by John Lindley. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    ] 6 Lanosa. Unger. Microscopic. Branched, transparent, jointed threads, the terminal joints of the small lateral branches of which at length acquire a reddish colour, and separate at the articulations, producing oblong spores. 1. L. nivalis Unger.—(Snow-mould.) Fig. 28. White patches, a foot or more in diameter, themselves consisting of numerous entangled circular patches, finally becoming red, as if dusted with red powder. Habitat. Beneath snow, on Grasses and cereal crops. Quality. Commits great ravages among the plants which it attacks, sometimes destroy- ing whole crops of corn. Especially injurious to Barley and Rye. Mucor. Miclieli. Microscopic. Cobwebby masses, consisting of tubular septate threads bearing at the end a roundish membranous spore-case, which bursts when plunged in water. 1. M. Mucedo Linnaeus.—(Common Mouldiness.) Fig. 16. Cobweb-like.; the fertile threads simple; spores and spore-cases blackish. Habitat. Fruit, paste and preserves. Quality. Destroys the quality of the substances it infests. Uredo. Persoon. Microscopic. Subcutaneous patches or masses of simple powdery spores. 1. U. Caries De Candolle—U. foetida of some.—(Bunt. Smut-balt.s. Pepper-brand.) Fig. 19. Spores black, rather large, spherical, foetid. Habitat. Within the ovary of corn ; 4,000,000 may be contained in a grain of Wheat. Quality. Destructive to corn, destroying all the interior. 2. U. segetum Persoon.—(Smut. Dust-brand.) Spores black, minute, spherical, scentless. Habitat. Rachis and receptacle of Grasses, especially Oats and Barley. Quality. Destructive to such corn, but less so than the last. Fig. 28.—Magnified views of Lanosa nivalis; (I, a patch of the plant; b, one of its threads ; at c, inflated and filled with spores.