Publication Date:
2024-05-22
Description:
The largest and most recently emended Marasmius sect. Globulares (Globulares-Sicci complex) has
increased in number of species annually while its infrasectional organization remains inconclusive. During forays in
remnants of theAtlantic Rainforest in Brazil, 24 taxa of Marasmius belonging to sect. Globulares were collected from
which nine are herein proposed as new: Marasmius altoribeirensis, M. ambicellularis, M. hobbitii, M. luteoolivaceus,
M. neotropicalis, M. pallidibrunneus, M. pseudoniveoaffinis, M. rhabarbarinoides and M. venatifolius. We took this
opportunity to evaluate sect. Globulares sensuAntonín & Noordel. in particular, combining morphological examination
and both single and multilocus phylogenetic analyses using LSU and ITS data, including Neotropical samples to a
broader and more globally distributed sampling of over 200 strains. Three different approaches were developed in
order to better use the genetic information via Bayesian and Maximum Likelihood analyses. The implementation
of these approaches resulted in: i) the phylogenetic placement of the new and known taxa herein studied among
the other taxa of a wide sampling of the section; ii) the reconstruction of improved phylogenetic trees presenting
more strongly supported resolution especially from intermediate to deep nodes; iii) clearer evidence indicating
that the series within sect. Sicci and sect. Globulares in the traditional concept are non-monophyletic by this more
stringent evaluation; and iv) the existence of several monophyletic suprespecific groups equivalent to the stirpes
of Singer – clusters of morphologically similar species. These two latter points corroborate with findings of previous
studies implementing analyses with the entire genus. Based on these results, we proposed a new infrasectional
classification elevating Singer’s concept of stirpes to series. Thirteen new series, the emendation of three extant
series and three subsections gathering these series based on the major clades are proposed.
Keywords:
Ecology
;
Evolution
;
Behavior and Systematics
;
Agaricales
;
Marasmiaceae
;
Neotropics
;
phylogenetics
;
stirpes
;
systematics
;
taxonomy
Repository Name:
National Museum of Natural History, Netherlands
Type:
info:eu-repo/semantics/article
Format:
application/pdf
Permalink
