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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Mycology and Phytopathology</journal-id><journal-title-group><journal-title xml:lang="en">Mycology and Phytopathology</journal-title><trans-title-group xml:lang="ru"><trans-title>Микология и фитопатология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0026-3648</issn><issn publication-format="electronic">3034-5421</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">681161</article-id><article-id pub-id-type="doi">10.31857/S0026364825010033</article-id><article-id pub-id-type="edn">ssdqnz</article-id><article-categories><subj-group subj-group-type="toc-heading"><subject>БИОРАЗНООБРАЗИЕ, СИСТЕМАТИКА, ЭКОЛОГИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">LM and SEM study of the type specimen of <italic>Diacheopsis pieninica</italic> (<italic>Myxomycetes</italic>)</article-title><trans-title-group xml:lang="ru"><trans-title>Исследование типового образца <italic>Diacheopsis pieninica</italic> (<italic>Myxomycetes</italic>) с помощью световой и сканирующей электронной микроскопии</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bortnikov</surname><given-names>F. M.</given-names></name><name xml:lang="ru"><surname>Бортников</surname><given-names>Ф. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>f.m.bortnikov@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Komarov Botanical Institute of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Ботанический институт им. В. Л. Комарова РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-02-23" publication-format="electronic"><day>23</day><month>02</month><year>2025</year></pub-date><volume>59</volume><issue>1</issue><issue-title xml:lang="ru"/><fpage>22</fpage><lpage>26</lpage><history><date date-type="received" iso-8601-date="2025-05-29"><day>29</day><month>05</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0026-3648/article/view/681161">https://journals.eco-vector.com/0026-3648/article/view/681161</self-uri><abstract xml:lang="en"><p>The previously presumed lost holotype of <italic>Diacheopsis pieninica</italic> is examined using light and scanning electron microscopy. A text description of this species from the original publication is given and supplemented with illustrations, more accurate measurements of spore diameter, and characteristics of capillitium, spores, and the peridium inner surface under SEM.</p></abstract><trans-abstract xml:lang="ru"><p>Ранее считавшийся утерянным голотип <italic>Diacheopsis pieninica </italic>изучен с использованием световой и сканирующей электронной микроскопии. Приведено текстовое описание этого вида из оригинальной публикации, дополненное иллюстрациями, более точными измерениями диаметра спор, а также характеристиками внутренней стороны перидия, капиллиция и спор на СЭМ.</p></trans-abstract><kwd-group xml:lang="en"><kwd>herbarium</kwd><kwd>holotype</kwd><kwd>morphology</kwd><kwd>Poland</kwd><kwd>rare species</kwd><kwd>SEM</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>гербарий</kwd><kwd>голотип</kwd><kwd>морфология</kwd><kwd>Польша</kwd><kwd>редкие виды</kwd><kwd>СЭМ</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Ministry of Science and Higher Education of the Russian Federation</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap></funding-source><award-id>124020100148-3</award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Ministry of Science and Higher Education of the Russian Federation</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Министерство науки и высшего образования Российской Федерации</institution></institution-wrap></funding-source><award-id>075-15-2021-1056</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Hooff J.P.M. van, Nannenga-Bremekamp N.E. 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