Abstract
ABSTRACT Morchella helvetica, sp. nov. (Morchella sect. Distantes) is a new species of true morels discovered in Switzerland. It is formally described in the present study using an integrative approach based on micro- and macromorphological characteristics, multilocus phylogenetics, and a brief description of its habitat. Molecular analyses clearly indicated that Morchella helvetica is a sister species to M. eximioides, M. angusticeps, and M. confusa. It can be distinguished by the two phylogenetic markers RNA polymerase II subunit 2 (RPB2) and translation elongation factor-1 alpha (TEF1-α). In addition, M. helvetica exhibits particular morphological features, notably the presence of pale hairs on the pileus, a mealy stipe, and darkening ridges when aging.
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