Lichenized species of Omphalina (Tricholomataceae) in the Iberian Peninsula

Abstract:A taxonomic revision of the lichenized species of the genus Omphalina in the Iberian Peninsula is presented, based upon fungal and lichen herbarium material, as well as on fresh collections. Relevant morphological and ecological features are discussed and a diagnostic key is provided. Four lichenized species, O. ericetorum, O. hudsoniana, O. meridionalis and O. velutina, are recognized. A squamulose vegetative thallus (Coriscium -type) is present only in O. hudsoniana, while the other three species form a thallus of hyphal globules (Botrydina -type). Anatomical features of the vegetative thallus cannot be used to distinguish between these last three species. Whilst O. hudsoniana is known only from the montane belt of the Eurosiberian Region and O. meridionalis seems to be restricted to the Mediterranean Region, living in more or less humid sites of the Supramediterranean belt, the other two species, O. ericetorum and O. velutina, are widespread.     

Genetic diversity of polysporic isolates of Moniliophthora perniciosa (Tricholomataceae)

The causal agent of witches' broom disease, Moniliophthora perniciosa is a hemibiotrophic and endemic fungus of the Amazon basin and the most important cocoa disease in Brazil. The purpose of this study was to analyze the genetic diversity of polysporic isolates of M. perniciosa to evaluate the adaptation of the pathogen from different Brazilian regions and its association with different hosts. Polysporic isolates obtained previously in potato dextrose agar cultures of M. perniciosa from different Brazilian states and different hosts (Theobroma cacao, Solanum cernuum, S. paniculatum, S. lycocarpum, Solanum sp, and others) were analyzed by somatic compatibility grouping where the mycelium interactions were distinguished after 4-8 weeks of confrontation between the different isolates of M. perniciosa based on the precipitation line in the transition zone and by protein electrophoresis through SDS-PAGE. The diversity of polysporic isolates of M. perniciosa was grouped according to geographic proximity and respective hosts. The great genetic diversity of M. perniciosa strains from different Brazilian states and hosts favored adaptation in unusual environments and dissemination at long distances generating new biotypes.     

Chemical constituents of some Tricholomataceae

Sterols, fatty acids and free amino acids of four species of Tricholomataceae were investigated. They contained ergosterol in high amount and the related sterols, fucosterol, sitosterol, cholesterol and brassicasterol. Linoleic and palmitic are the main unsaturated and saturated fatty acids respectively. The most abundant free amino acids were alanine, valine and proline.     

Tricholoma fulvimarginatum (Tricholomataceae): A new species from North America associated with cottonwood

Tricholoma fulvimarginatum is described as a new species of Agaricales from eastern North America. This fungus belongs in subgenusTricholoma sectionGenuina due to the coloration of the pileus surface. The orange-brown pileus, marginate lamellae, and presumed mycorrhizal association withPopulus deltoides distinguish this species from others in the section.     

滇产与日产松茸的IGS1-RFLP比较分析

应用Cfr13I限制性内切酶对采自于云南省16个市县的127个松茸子实体进行了IGS1-RFLP比较分析,发现126个松茸子实体属于A类型,来自大理白族自治州剑川县的1例(TF89)为C类型。通过对A类型的IGS1序列分析发现产自云南的松茸有一个CTTT的简单重复,滇产松茸IGS1序列差异不明显。滇产松茸的IGS1-RFLP与日产松茸的主要类型十分相似,两地松茸可能是同源的。     

A new taxon in the Infundibulicybe gibba complex (Basidiomycota, Agaricales, Tricholomataceae) from Sardinia (Italy)

A new species of Infundibulicybe (viz. I. mediterranea sp. nov.) is described from Sardinia based both on morphological and molecular ITS data. The species, a close ally of I. gibba, differs from the latter in the darker tinges of the basidiomata, the stipe, which is nearly concolorous with the pileus, and smaller basidiospores. Drawings of the main micro-morphological features as well as a color photograph of fresh basidiomata in situ are provided.     

Notes onConocybe (Bolbitiaceae)

The mycological exploration of the Viennese nature preserve Lobau, resulted in the discovery of several new species ofBasidiomycetes; of special interest is the genusConocybe of which the authors present two new taxa:C. lobauensis andC. leporina var.tetraspora. FurthermoreC. neoantipus, C. striatipes andC. caespitosa are discussed, and the new varietiesC. neoantipus var.tucumana and var.carinthiaca as well asC. striatipes var.sejuncta are proposed.     

Notes onPsathyrella dunensis (Coprinaceae)

Psathyrella dunensis Kits van Waveren, so far only known from the type locality in the Netherlands, was found in E. Austria and is more fully described. New information about its macro- and microscopical characters, ecology and distribution is provided and discussed. The carpophores vary more in size and surface structure than hitherto observed. Its habitat comprises riparian forests and other sandy soils like e.g. sand-dunes.     

Notes on Echinodorus (Alismataceae)

Errors by Rataj in lecto- and neotypification of five names inEchinodorus are corrected. These errors include the selection of lectotype specimens that were not cited in the protologue and the designation of neotypes from syntypes. Lectotypes for four of the names are designated here. The other is not typified at this time, as we have as yet been unable to examine the cited collections. In addition, a lectotype is designated for the Linnaean nameAlisma cordifolia, a name for which Rataj did not choose a lectotype. A new species,Echinodorus reticulatus, is described and illustrated. Five new combinations at the subspecies level are proposed, with most of these subspecies having a distribution from Central America to Paraguay and Argentina.     

Notes on Bletia (Orchidaceae)

New species ofBletia from Mexico are described and illustrated:B. concolor, B. similis, andB. urbana. The identity ofB. campanulata Llave & Lex. is discussed, andB. reflexa Lindl. is considered to be a distinct species. Several South American epithets are treated as synonyms ofB. campanulata. A key to the recognized species ofBletia is given.     

Notes on Ischnosiphon (Marantaceae)

Four new species are described, viz. Ischnosiphon bahiensis (Brazil), I. ursinus (French Guiana and Rio Negro Basin), I. crassispicus (vicinity of Manaus), and I. fusiformis (NE Peru). New data on ecology, morphology, or distribution are presented for I. inflatus Anderss., I. enigmaticus Anderss., I. centricifolius Anderss., I. gracilis (Rudge) Koern., I. helenae Anderss., I. macarenae Anderss., I. polyphyllus (P. & E.) Koern., and I. surumuensis Loes. The typification of I. arouma (Aubl.) Koern. is briefly discussed.