6 research outputs found
Finding AGN remnant candidates based on radio morphology with machine learning
Remnant radio galaxies represent the dying phase of radio-loud active
galactic nuclei (AGN). Large samples of remnant radio galaxies are important
for quantifying the radio galaxy life cycle. The remnants of radio-loud AGN can
be identified in radio sky surveys based on their spectral index, or,
complementary, through visual inspection based on their radio morphology.
However, this is extremely time-consuming when applied to the new large and
sensitive radio surveys. Here we aim to reduce the amount of visual inspection
required to find AGN remnants based on their morphology, through supervised
machine learning trained on an existing sample of remnant candidates. For a
dataset of 4107 radio sources, with angular sizes larger than 60 arcsec, from
the LOw Frequency ARray (LOFAR) Two-Metre Sky Survey second data release
(LoTSS-DR2), we started with 151 radio sources that were visually classified as
'AGN remnant candidate'. We derived a wide range of morphological features for
all radio sources from their corresponding Stokes-I images: from simple source
catalogue-derived properties, to clustered Haralick-features, and
self-organising map (SOM) derived morphological features. We trained a random
forest classifier to separate the 'AGN remnant candidates' from the not yet
inspected sources. The SOM-derived features and the total to peak flux ratio of
a source are shown to be most salient to the classifier. We estimate that
of sources with positive predictions from our classifier will be
labelled 'AGN remnant candidates' upon visual inspection, while we estimate the
upper bound of the confidence interval for 'AGN remnant candidates' in
the negative predictions at . Visual inspection of just the positive
predictions reduces the number of radio sources requiring visual inspection by
.Comment: 23 pages; accepted for publication in A&
Fungal Planet description sheets : 320–370
Novel species of fungi described in the present study include the following from Malaysia: Castanediella
eucalypti from Eucalyptus pellita, Codinaea acacia from Acacia mangium, Emarcea eucalyptigena from Eucalyptus
brassiana, Myrtapenidiella eucalyptorum from Eucalyptus pellita, Pilidiella eucalyptigena from Eucalyptus brassiana
and Strelitziana malaysiana from Acacia mangium. Furthermore, Stachybotrys sansevieriicola is described from
Sansevieria ehrenbergii (Tanzania), Phacidium grevilleae from Grevillea robusta (Uganda), Graphium jumulu from
Adansonia gregorii and Ophiostoma eucalyptigena from Eucalyptus marginata (Australia), Pleurophoma ossicola from
bone and Plectosphaerella populi from Populus nigra (Germany), Colletotrichum neosansevieriae from Sansevieria
trifasciata, Elsinoë othonnae from Othonna quinquedentata and Zeloasperisporium cliviae (Zeloasperisporiaceae
fam. nov.) from Clivia sp. (South Africa), Neodevriesia pakbiae, Phaeophleospora hymenocallidis and Phaeophleospora
hymenocallidicola on leaves of a fern (Thailand), Melanconium elaeidicola from Elaeis guineensis (Indonesia),
Hormonema viticola from Vitis vinifera (Canary Islands), Chlorophyllum pseudoglobossum from a grassland (India),
Triadelphia disseminata from an immunocompromised patient (Saudi Arabia), Colletotrichum abscissum from Citrus
(Brazil), Polyschema sclerotigenum and Phialemonium limoniforme from human patients (USA), Cadophora vitícola
from Vitis vinifera (Spain), Entoloma flavovelutinum and Bolbitius aurantiorugosus from soil (Vietnam), Rhizopogon
granuloflavus from soil (Cape Verde Islands), Tulasnella eremophila from Euphorbia officinarum subsp. echinus
(Morocco), Verrucostoma martinicensis from Danaea elliptica (French West Indies), Metschnikowia colchici from
Colchicum autumnale (Bulgaria), Thelebolus microcarpus from soil (Argentina) and Ceratocystis adelpha from
Theobroma cacao (Ecuador). Myrmecridium iridis (Myrmecridiales ord. nov., Myrmecridiaceae fam. nov.) is also
described from Iris sp. (The Netherlands). Novel genera include (Ascomycetes): Budhanggurabania from Cynodon
dactylon (Australia), Soloacrosporiella, Xenocamarosporium, Neostrelitziana and Castanediella from Acacia mangium
and Sabahriopsis from Eucalyptus brassiana (Malaysia), Readerielliopsis from basidiomata of Fuscoporia wahlbergii
(French Guyana), Neoplatysporoides from Aloe ferox (Tanzania), Wojnowiciella, Chrysofolia and Neoeriomycopsis
from Eucalyptus (Colombia), Neophaeomoniella from Eucalyptus globulus (USA), Pseudophaeomoniella from Olea
europaea (Italy), Paraphaeomoniella from Encephalartos altensteinii, Aequabiliella, Celerioriella and Minutiella from
Prunus (South Africa). Tephrocybella (Basidiomycetes) represents a novel genus from wood (Italy). Morphological
and culture characteristics along with ITS DNA barcodes are provided for all taxa.Alina V. Alexandrova was supported by the Russian Science
Foundation (project N 14-50-00029). Ekaterina F. Malysheva, Olga V.
Morozova,
Alexander E. Kovalenko and Eugene S. Popov acknowledge
financial support from the Russian Foundation for Basic Research (project
13-04-00838a and 15-04-04645a). Margarita Dueñas, María P. Martín and
M. Teresa Telleria acknowledge financial support from the Plan Nacional I+D+I
projects No. CGL2009-07231 and CGL2012-3559. Cony Decock gratefully acknowledges the financial support received from
the FNRS / FRFC (convention FRFC 2.4544.10), the CNRS-French Guiana
and the Nouragues staff, which enabled fieldwork in French Guiana, and the
Belgian State – Belgian Federal Science Policy through the BCCMTM research
programme.http://www.ingentaconnect.com/content/nhn/pimjam201
Fungal diversity notes 253-366: taxonomic and phylogenetic contributions to fungal taxa
Notes on 113 fungal taxa are compiled in this paper, including 11 new genera, 89 new species, one new subspecies, three new combinations and seven reference specimens. A wide geographic and taxonomic range of fungal taxa are detailed. In the Ascomycota the new genera Angustospora (Testudinaceae), Camporesia (Xylariaceae), Clematidis, Crassiparies (Pleosporales genera incertae sedis), Farasanispora, Longiostiolum (Pleosporales genera incertae sedis), Multilocularia (Parabambusicolaceae), Neophaeocryptopus (Dothideaceae), Parameliola (Pleosporales genera incertae sedis), and Towyspora (Lentitheciaceae) are introduced. Newly introduced species are Angustospora nilensis, Aniptodera aquibella, Annulohypoxylon albidiscum, Astrocystis thailandica, Camporesia sambuci, Clematidis italica, Colletotrichum menispermi, C. quinquefoliae, Comoclathris pimpinellae, Crassiparies quadrisporus, Cytospora salicicola, Diatrype thailandica, Dothiorella rhamni, Durotheca macrostroma, Farasanispora avicenniae, Halorosellinia rhizophorae, Humicola koreana, Hypoxylon lilloi, Kirschsteiniothelia tectonae, Lindgomyces okinawaensis, Longiostiolum tectonae, Lophiostoma pseudoarmatisporum, Moelleriella phukhiaoensis, M. pongdueatensis, Mucoharknessia anthoxanthi, Multilocularia bambusae, Multiseptospora thysanolaenae, Neophaeocryptopus cytisi, Ocellularia arachchigei, O. ratnapurensis, Ochronectria thailandica, Ophiocordyceps karstii, Parameliola acaciae, P. dimocarpi, Parastagonospora cumpignensis, Pseudodidymosphaeria phlei, Polyplosphaeria thailandica, Pseudolachnella brevifusiformis, Psiloglonium macrosporum, Rhabdodiscus albodenticulatus, Rosellinia chiangmaiensis, Saccothecium rubi, Seimatosporium pseudocornii, S. pseudorosae, Sigarispora ononidis and Towyspora aestuari. New combinations are provided for Eutiarosporella dactylidis (sexual morph described and illustrated) and Pseudocamarosporium pini. Descriptions, illustrations and/or reference specimens are designated for Aposphaeria corallinolutea, Cryptovalsa ampelina, Dothiorella vidmadera, Ophiocordyceps formosana, Petrakia echinata, Phragmoporthe conformis and Pseudocamarosporium pini. The new species of Basidiomycota are Agaricus coccyginus, A. luteofibrillosus, Amanita atrobrunnea, A. digitosa, A. gleocystidiosa, A. pyriformis, A. strobilipes, Bondarzewia tibetica, Cortinarius albosericeus, C. badioflavidus, C. dentigratus, C. duboisensis, C. fragrantissimus, C. roseobasilis, C. vinaceobrunneus, C. vinaceogrisescens, C. wahkiacus, Cyanoboletus hymenoglutinosus, Fomitiporia atlantica, F. subtilissima, Ganoderma wuzhishanensis, Inonotus shoreicola, Lactifluus armeniacus, L. ramipilosus, Leccinum indoaurantiacum, Musumecia alpina, M. sardoa, Russula amethystina subp. tengii and R. wangii are introduced. Descriptions, illustrations, notes and / or reference specimens are designated for Clarkeinda trachodes, Dentocorticium ussuricum, Galzinia longibasidia, Lentinus stuppeus and Leptocorticium tenellum. The other new genera, species new combinations are Anaeromyces robustus, Neocallimastix californiae and Piromyces finnis from Neocallimastigomycota, Phytophthora estuarina, P. rhizophorae, Salispina, S. intermedia, S. lobata and S. spinosa from Oomycota, and Absidia stercoraria, Gongronella orasabula, Mortierella calciphila, Mucor caatinguensis, M. koreanus, M. merdicola and Rhizopus koreanus in Zygomycota