Читать книгу Identification of the Larger Fungi - Roy Watling - Страница 32

There is little doubt that the genus Russula and the genus Lactarius are closely related; in fact they stand aside from the other agarics in the very important character mentioned on page 46. In Europe the easiest distinction between the two genera is that members of the genus Lactarius exude a milk-like juice which may be white or variously coloured depending on the species involved (e.g. purple in L. uvidus (Fries) Fries, yellow in L. chrysorheus Fries). The cap, stem and frequently the gills are brittle and when broken liberate the milk-like liquid; when the fruit-body is dry, however, the presence of this liquid may be difficult to demonstrate. The spores have a blue-black ornamentation under the microscope when mounted in iodine, and although when in mass the colours are not as varied as those found in the genus Russula there is every likelihood that they will play an important role in the classification of the group in the future. The colour of the spore-print has been rather neglected, although the genus includes some rather unusual fungi.