Abstract
Abstract Preliminary observations on spore ornementation of Russula, as seen in the scanning electron microscope. — The spores of 16 species of Russula have been examined in the scanning electron microscope, as a preliminary attempt to see if an accurate examination of the spore surface at the ultrastructural level could reveal details of ornamentation which might be useful for the classification of the many species of this genus. The examination, carried out both on fixed and unfixed specimens, has demonstrated that the spore shape is always round or slightly elliptic, and that the obnormal forms as previously described are probably artifacts. Five main types of ornamentation have been described: single wart-like and single finger-like Protrusion, wart- or finger-like protrusions interconnected by thin ridges, and thick, short « papillae » together with large ridges that run along large tracts of the spore circumference. The type of ornamentation was a constant character in each species.
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