| 1. |
- Eliseo, Battistin, et al.
(författare)
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Morphological characterisation and phylogenetic placement of the very rare species Psathyrella sulcatotuberculosa
- 2014
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Ingår i: Sydowia. - 0082-0598. ; 66:2, s. 171-181
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Tidskriftsartikel (refereegranskat)abstract
- A recent find of the very rare species Psathyrella sulcatotuberculosa (Psathyrellaceae) from Italy provided the authors with new data useful for improving the knowledge of an almost mysterious entity. Of this collection, a detailed morphological description, a statistical analysis of the spore size along with several photographs of the basidiomata in field and microscopical structures are provided and compared with the features of the type collection. Morphologically and/or molecularly allied species are discussed. Phylogenetic analysis of Psathyrellaceae based on sequence data from the nuclear ribosomal DNA internal transcribed region and partial large subunit placed P. sulcatotuberculosa in the P. candolleana clade with strong statistical support, together with P. candolleana, P. badiophylla, P. leucotephra and P. typhae. The result is also supported by morphology, where the species in the clade all lack pleurocystidia but have clavate, utriform and lageniform cheilocystidia with a rounded apex.
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| 2. |
- Leif, Örstadius, et al.
(författare)
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Molecular phylogenetics and taxonomy in Psathytellaceae (Agaricales) with focus on psathyrelloid species: introduction of three new genera and 18 new species.
- 2015
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Ingår i: Mycological progress. - : Springer Science and Business Media LLC. - 1617-416X .- 1861-8952. ; 14:5
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Tidskriftsartikel (refereegranskat)abstract
- Based on traditional morphology, sequence data,and phylogenetic analyses, 18 new species are here described: Coprinellus christianopolitanus, Coprinopsis musae, C. udicola, Psathyrel l a arenosa, P. carmine i ,P. fennoscandica, P. ichnusae, P. lilliputana, P. lyckebodensis, P. madida, P. rybergii, P. sabuletorum, P. scanica, P. siccophila, P. stridvallii, P. sublatispora, P. vesterholtii, and Typhrasa nanispora. Psathyrella hololanigera and P. tenera are reported as new to Europe and P. parva as new to the Nordic countries. A four-gene dataset on Psathyrellaceae were analyzed by Maximum Parsimony, Maximum Likelihood, and Bayesian methods. Constraint analyses were performed to determine limits of /Psathyrella, and to evaluate whether the / Coprinellus, /cordisporus, and /gossypina clades could be regarded with confidence as monophyletic clades outside of the clade /Psathyrella. This was not unambiguously supported. Based on the phylogenetic results, Kauffmania is proposed as a monotypic genus for the species P. larga and Typhrasa for P. gossypina and the new described species T. nanispora. The genus Homophron is formally validated and three combinations are proposed: H. spadiceum, H. cernuum, and H. camptopodum. The genus Cystoagaricus Singer is emended and the following new combinations are proposed: C. hirtosquamulosus, C. squarrosiceps, C. olivaceogriseus, and C. silvestris. Neotypes have been selected for seven species described by Fries, and ITS sequence data for these were generated. The following new combinations are proposed: Coprinopsis canoceps, C. cineraria, C. melanthina, C. submicrospora, C. uliginicola, and Typhrasa gossypina. Brief comments are given to other species of interest. Psathyrella ornatispora were found not to belong in Psathyrellaceae. A key to 106 psathyrelloid species in Northern Europe is provided.
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| 3. |
- Nagy, Laszlo G., et al.
(författare)
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The evolution of autodigestion in the mushroom family Psathyrellaceae (Agaricales) inferred from Maximum Likelihood and Bayesian methods
- 2010
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Ingår i: Molecular Phylogenetics and Evolution. - 1055-7903. ; 57, s. 1037-1048
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Tidskriftsartikel (refereegranskat)abstract
- Recently developed comparative phylogenetic methods offer a wide spectrum of applications in evolutionary biology, although it is generally accepted that their statistical properties are incompletely known. Here, we examine and compare the statistical power of the ML and Bayesian methods with regard to selection of best-fit models of fruiting-body evolution and hypothesis testing of ancestral states on a real-life data set of a physiological trait (autodigestion) in the family Psathyrellaceae. Our phylogenies are based on the first multigene data set generated for the family. Two different coding regimes (binary and multistate) and two data sets differing in taxon sampling density are examined. The Bayesian method outperformed Maximum Likelihood with regard to statistical power in all analyses. This is particularly evident if the signal in the data is weak, i.e. in cases when the ML approach does not provide support to choose among competing hypotheses. Results based on binary and multistate coding differed only modestly, although it was evident that multistate analyses were less conclusive in all cases. It seems that increased taxon sampling density has favourable effects on inference of ancestral states, while model parameters are influenced to a smaller extent. The model best fitting our data implies that the rate of losses of deliquescence equals zero, although model selection in ML does not provide proper support to reject three of the four candidate models. The results also support the hypothesis that non-deliquescence (lack of autodigestion) has been ancestral in Psathyrellaceae, and that deliquescent fruiting bodies represent the preferred state, having evolved independently several times during evolution.
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| 4. |
- Örstadius, Leif, et al.
(författare)
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Psathyrella confundens (Psathyrellaceae, Agaricales) — a moist growing new species from Europe
- 2021
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Ingår i: Agarica. - 0800-1820. ; 42, s. 31-37
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Tidskriftsartikel (refereegranskat)abstract
- Based on phylogenetic analyses and morpho- logy the new species Psathyrella confundens is described. It is so far known from France, Germany and Sweden. The ambiguous use of the name Drosophila albidula is discussed. The species is recognised by small basidiomata, scanty veil, acute cystidia, large spores, and a moist habitat. Separating characters of closely related species are given.
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