Whether the strong odour of trimethylamine evolved by the spores of Tilletia attracts insects is not known.
Brefeld regarded the promycelium as a kind of basidium, bearing lateral or terminal conidia (comparable to basidiospores), but since the number of basidiospores is not fixed, and the basidium has not yet assumed very definite morphological characters, Brefeld termed the group Hemibasidii, and regarded them as a halfway stage in the evolution of the true Basidiomycetes from Ph co Y Y mycetes, the Tilletia type leading to the true basidium (Autobasidium), the Ustilago type to the proto pm basidium, with lateral spores; but this p m view is based on very poor evidence, so that it is best to place these forms?p, c;,::, as a separate group, the Ustilaginales.
A, of Ustilago receptaculorum; of Tilletia Caries (X 460).
Tilletia Tritici, bunt or stinking smut of wheat, is so-called because the bunted grain has a disagreeable odour of stale herrings.
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