Abstract Detail

Systematics

Seelan, Jaya Seelan Sathiya [1], Justo, Alfredo [1], Nagy, Laszlo [1], Hibbett, David [1], Hughes, Karen [2].

Phylogenetic relationships and morphological evolution in Lentinus, Polyporellus and Neofavolus, emphasizing Southeast Asian taxa.

The genus Lentinus (Polyporaceae, Basidiomycota) species is widely documented from tropical and temperate forests and is taxonomically controversial. Here, we studied the relationships between Lentinus subg. Lentinus sensu Pegler, i.e. sections Lentinus, Tigrini, Dicholamellatae, Rigidi, Lentodiellum and Pleuroti and polypores that share similar morphological characters. We obtained 27 ITS, 20 nLSU and 19 rpb1 sequences, focusing on Lentinus subg. Lentinus sensu Pegler and the Neofavolus group, and performed phylogenetic analyses using maximum likelihood and Bayesian methods. We also evaluated the transition in hymenophore morphology between Lentinus, Neofavolus and some related polypores using ancestral state reconstruction. Single gene phylogenies and phylogenies combining ITS and nLSU with RPB1 or RPB2 genes all support existence of a Lentinus/Polyporellus clade and a separate Neofavolus clade. Polyporellus (represented by P. arcularius, P. ciliatus, and P. brumalis) forms a clade with species representing Lentinus subg. Lentinus sensu Pegler (1983), excluding L. suavissimus. Lentinus tigrinus appears as the sister group of Polyporellus in the four-gene phylogeny, but this placement was weakly supported. All three multigene analyses and the single-gene analyses using ITS and rpb2 strongly support Polyporus tricholoma as the sister group of the Lentinus/Polyporellus clade; only nLSU fails to support this placement. Under parsimony, the ancestral hymenophoral configuration for the Lentinus/Polyporellus clade is estimated to be angular pores, with independent transitions to circular pores and lamellae. The ancestral state for the Neofavolus clade is estimated to be angular pores, with a single transition to lamellae in L. suavissimus. We propose that Lentinus suavissimus (section Pleuroti) should be reclassified as Neofavolus suavissimus comb. nov.  

1 - Clark University, Biology, 950 Main St, Worcester, Massachusetts, 01610, United States
2 - University of Tennessee, Ecology and Evolutionary Biology, 437 Hesler Biology Building, Knoxville, Tennessee , 1100, USA

Keywords:
Taxonomy
Lentinus sensu stricto
Lentinus suavissimus
multi-gene phylogeny
PolyPEET.

Presentation Type: Offered Paper - Paper
Session: 10
Location: Auditorium/Kellogg Hotel and Conference Center
Date: Tuesday, June 10th, 2014
Time: 11:00 AM
Number: 10003
Abstract ID:53
Candidate for Awards:Graduate Student Oral Presentation Award