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UR 1264 - MYCSA : Mycologie et securite des aliments

MycSA

Mycologie & Sécurité des Aliments
INRA Bordeaux-Aquitaine
BP 81
33883 Villenave d'Ornon Cedex

A phylogenetic and morphological overview of sections Bohusia, Sanguinolenti, and allied sections within Agaricus subg. Pseudochitonia with three new species from France, Iran, and Portugal

18 December 2017

New Agaricus
A new paper published in Fungal Biology

Mahdizadeh V., Parra L.A., Safaie N., Goltapeh E.M., Chen J., Guimberteau J, Callac P. (2017) A pylogenetic and morphological overview of sections Bohusia, Sanguinolenti, and allied sections within Agaricus sub. Pseudochitonia with three new species from France, Iran and Portugal. Fungal Biology. 112: 34-51.  https://doi.org/10.1016/j.funbio.2017.10.001

Abstract

The genus Agaricus was recently rearranged to accommodate numerous tropical taxa. Accordingly,
the genus was split into six subgenera and 22 sections of which 12 are included
in A. subg. Pseudochitonia. Preliminary data indicated that three putative new species belong
to this subgenus. Our objectives were to describe these species, to determine to which sections
they belong,and to experience the interest of sometraditional traits in this new context.
We morphologically described Agaricus coniferarum from France and Portugal, Agaricus iranicus
from Iran, and Agaricus lusitanicus from Portugal. Multi-gene phylogenetic analyses based
on ITS, LSU, and tef1 sequence data of representatives of the 12 sections clearly indicated that
A. coniferarum and A. lusitanicus are placed in Agaricus sect. Bohusia, while A. iranicus is in A.
sect. Sanguinolenti. Incidentally, we replaced the illegitimate name Agaricus magnivelaris by
Agaricus fiardianus. In a phylogenetic tree, based on all available ITS sequence data and focussing
on six related sections,we examined the phylogenetic distribution of various characters.
The intensity of red discolouration when the sporocarp is rubbed or cut appeared as a phylogenetically
weak informative trait. We propose a determination key leading to a group of
three hardly distinguishable sections (Bohusia, Nigrobrunnescentes, and Sanguinolenti).