FIG. ioo. Typical forms of basidia in the Basidiomycetes. i, basidia 

 and spores of Tulostoma mammosum : the basidia are elongated, and the 

 spores grow along its length as in the Hemibasidiomycetes, but the 

 basidium is not septate ; 2, bisporous basidium of Dacryomyces deliques- 

 cens. 3, basidia and fusiform cystidia having the upper portion covered 

 with particles of oxalate of lime, of Peniophora inconspicua. 4, bi- porous 

 basidia of Lycoperdon echinatum. 5, two spores of same showing the 

 persistent sterigmata. 6, tetrasporous basidia with sessile spores, of 

 Scleroderma vulgare. 7, portion of hymenium of a typical agaric, Inocybe 

 aster ospora, showing tetrasporous basidia ; paraphyses, somewhat smaller 

 than the basidia, and not bearing sterigmata ; cystidia, longer than the 

 basidia. In many species of Inocybe, like the present one, the cystidia, 

 when mature, are crowned by an amorphous mass, resembling a cluster of 

 dark-coloured crystals. This is caused by the exudation and hardeningof 

 the contents of the cystidium. 8, free spore of No. 7. All highly mag. 



