Abstract
In the present series the author describes and discusses various forms of the "stirps" Laccaria laccata, and describes as new Gerronema subgallidum, G. angustifolium, Hemimycena subtropicalis, Mycena aconquijensis, M. austroalcalina, M. februaria, M. heroica M. sosarum, Amanita aestivalis, Psathyrella macquariensis, Conocybe haloghila, Bolbitius tucumanensis, Agrocybe firma var. tucumana, A. xerophytica, most of these from Argentina, some from U. S. A. (A. aestivalis, G. angustifolium), Afghanistan (C. halophila) and the Macquarie Islands. Some new combinations are proposed and some species are redescribed.

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