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Leucoagaricus decipiens and La. erythrophaeus, a new species pair in sect. Piloselli

     111 Koshland Hall 3102, Department of Plant & Microbial Biology, University of California at Berkeley, Berkeley, California 94720-3102

Marco Contu

     Via Marmilla, 12, 07026 Olbia (OT), Italy

Alfredo Vizzini

     Dipartimento di Biologia Vegetale, Università di Torino, Viale Mattioli 25, 10125 Torino, Italy

Leucoagaricus decipiens and La. erythrophaeus, are described as new from Sardinia, Italy, and California, USA, respectively. These sister species show distinct reddening when touched on all parts of the basidiocarps and darken on drying. Their collariate lamellae, broadly cylindrical to utriform cheilocystidia and trichodermal pileus covering distinguish them morphologically from other species in sect. Piloselli, while nrITS and EF1- sequences distinguish them from each other. Leucoagaricus erythrophaeus has been known under the name Lepiota roseifolia, but the type collection of this species does not fit the interpretation.

Key words: Agaricaceae, biodiversity, Mediterranean, nrITS and EF1- sequences