Species of Agaricus occurring in New Zealand

A key is provided for 21 species occurring in New Zealand: Agaricus arvensi s, A. augustus, A. bambusae var, australis, A. bernardii, A. bisporus var. bisporus, A. bitorquis, A. campestris var. campestris, A. campestris cf. va r. floccipes, A. cupreobrunneus, A. horakii, A. impudicus (= A. variegans), A. lanatoniger, A. lanipes, A. meleagris, A. oligocystis, A. porphyrocepha lus, A. purpureoniger, A. semotus, A. subperonatus, A. viridopurpurascens, and A. xanthoderma. Full descriptions are given for those taxa encountered by the authors in the field, including 10 species which are considered cosm oplitan in distribution. Six of these species are new records for New Zeala nd.