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Esquel, Argentina

Drechsler-Santos E.R.,Federal University of Santa Catarina | Robledo G.L.,National University of Cordoba | Limajunior N.C.,Federal University of Pernambuco | Malosso E.,Federal University of Pernambuco | And 4 more authors.
Phytotaxa | Year: 2016

A new poroid genus with two conspicuous and common species growing on living Fabaceae trees is described from the Seasonally Dry Tropical Forests biome of Brazil. Both taxa in this forest pathogen genus resemble Phellinus rimosus macroscopically, but are distinguished by a dimitic hyphal system with skeletal hyphae present only in the trama of the tube layer while the context remains monomitic, and by the ellipsoid, thick-walled, adaxially flattened, yellow basidiospores that turn chestnut brown in KOH solution. Molecular and morphological studies of Brazilian specimens macroscopically similar to the Phellinus rimosusspecies complex were carried out to solve their phylogenetic relationships among the Hymenochaetaceae. Phellinotus gen. nov.with P. neoaridus sp. nov.as the genus type and P. piptadeniae comb. nov.are presented and described. Phylogenetically, Phellinotusis closely related to Arambarria, Inocutis, Fomitiporellaand other taxonomically unresolved terminal clades, and unrelated to Fulvifomesand Phylloporia. Phellinotusand other genera of poroid Hymenochaetaceae that lack setae or setal hyphae and produce thick-walled, colored (pale yellow to rusty brown) basidiospores form a phylogenetic group here named the ‘phellinotus clade’. Our results indicate the need to include taxa from unexplored areas in order to get a thorough understanding of the phylogeny of the Hymenochaetaceae. © 2016 Magnolia Press. Source

Rajchenberg M.,Centro Forestal CIEFAP | Robledo G.,National University of Cordoba
Forest Pathology | Year: 2013

Summary: We surveyed the polypore species associated with living hosts in Argentina. We reviewed the literature on polypores found in Argentina and, in addition with the study of unpublished herbarium material, present a list of 87 species decaying living trees in native forests and introduced plantations. The rot type, host(s), distribution and remarks are presented for each species. Among 87 species found, 71 produce a white rot and 16 a brown rot in wood; 61 species were exclusively found on native hosts and 7 on exotic, cultivated hosts, while 18 were found on both types of substrates; one species, Amylosporus campbellii, was exclusively found associated with grasses. For most cases, there are no pathological studies based on rot measurement and culture isolation to determine incidence and severity of the decay. © 2013 Blackwell Verlag GmbH. Source

Dai Y.-C.,Beijing Forestry University | Xue H.-J.,CAS Shenyang Institute of Applied Ecology | Vlasak J.,Academy of Sciences of the Czech Republic | Rajchenberg M.,Centro Forestal CIEFAP | And 2 more authors.
Fungal Diversity | Year: 2014

Polyporus accommodates species with stipitate basidiocarps, a dimitic hyphal system with skeleto-binding hyphae, and hyaline, thin-walled, more or less cylindrical basidiospores. The species of Polyporus are divided into six morphological groups, of which Melanopus is characterized by coriaceous basidiocarps, thin context and a black cuticle on the stipe. In this study, we explore the phylogeny and species diversity of Polyporus sensu lato focusing on the group Melanopus based on global samples. Our combined ITS and nLSU dataset included 117 collections represented by 117 ITS and 94 nLSU sequences, of which 43 ITS and 37 nLSU sequences were newly generated. The resulting phylogenetic analysis recovered four clades, Favolus, Neofavolus, Melanopus and Polyporellus clades, while several species in the morphological groups Melanopus and Polyporus were outside these clades. Combined with morphological evidence, three new species in the Melanopus clade, Polyporus americanus, P. austroandinus and P. conifericola, are newly described and illustrated, and their distinctive characters are discussed. The illegitimate name Polyporus fraxineus is renamed as Polyporus fraxinicola. The phylogeny and taxonomy of each species in group Melanopus (morphology) or Melanopus clade (phylogeny) and related species are briefly discussed. © 2013 Mushroom Research Foundation. Source

Baltazar J.M.,Federal University of Rio Grande do Sul | Da Silveira R.M.B.,Federal University of Rio Grande do Sul | Rajchenberg M.,Centro Forestal CIEFAP
Phytotaxa | Year: 2013

Examination of the original material of Asterostromella roseola Bres. ex Rick confirmed that it is a good morphological species, characterized by simple-septate generative hyphae, dendrohyphidia and halocystidia, and hyaline, smooth, IKI-basidiospores. Its morphological affinities with current accepted corticioid genera are discussed, and the new combination Dendrocorticium roseolum is proposed. A lectotype is selected and description and drawings are provided. © 2013 Magnolia Press. Source

Rajchenberg M.,Centro Forestal CIEFAP
Mycologia | Year: 2011

This is a review of the available knowledge on nuclear behavior of the mycelium within polypore genera (Agaricomycetes, Basidiomycota). Information on 68 genera showed that nuclear behavior is a distinct and consistent feature at genus level and can be coupled with phylogenetic differentiation. The sole exception was found in Polyporus, where different species with normal, heterocytic and astatocoenocytic nuclear behaviors were found. Of the 68 genera treated 41 (60.3%) displayed a normal nuclear behavior, nine (13.2%) were heterocytic, nine (13.2%) were astatocoenocytic and another eight (11.8%) were holocoenocytic. In 95% of the genera a unique compatibility system was found, with the exceptions of Antrodia, which includes both homothallic and bipolar species all associated with a normal nuclear behavior, and Spongipellis, in which bipolar and tetrapolar species are found, all displaying an astatocoenocytic nuclear behavior. Normal and heterocytic nuclear behaviors were associated mostly with tetrapolarity, astatocoenocity was associated mostly with bipolarity, and holocoenocity was associated with either bipolarity or purported homothallism. The combination of nuclear behavior with mating system and brown or white rot capability appeared as a strong feature characterizing and distinguishing the genera of polypores, each combination being valuable to differentiate between apparently related genera, as is supported by phylogenetic studies. Several examples are presented to support this idea, as well as the cases of species that are problematic to this concept. Poroid genera of Hymenochaetaceae were treated apart because of the lack of knowledge regarding their nuclear behavior. In addition new information on the sexuality and/or nuclear behavior of 15 polyporoid taxa is given. © 2011 by The Mycological Society of America, Lawrence, KS 66044-8897. Source

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