Phylogenetic classification of arbuscular mycorrhizal fungi: new species and higher-ranking taxa in Glomeromycota and Mucoromycota (class Endogonomycetes) Author Tedersoo, Leho Mycology and Microbiology Center, University of Tartu, 2 Liivi, 50409 Tartu, Estonia & Department of Zoology, College of Science, King Saud University, 12371 Riyadh, Saudi Arabia Author Magurno, Franco 0000-0002-3117-8149 Institute of Biology, Biotechnology and Environmental Protection, Faculty of Natural Sciences, University of Silesia in Katowice, Jagiellońska 28, 40 - 032 Katowice, Poland Author Alkahtani, Saad 0000-0001-7381-5110 Department of Zoology, College of Science, King Saud University, 12371 Riyadh, Saudi Arabia Author Mikryukov, Vladimir 0000-0003-2786-2690 Mycology and Microbiology Center, University of Tartu, 2 Liivi, 50409 Tartu, Estonia text MycoKeys 2024 2024-08-09 107 249 271 journal article 10.3897/mycokeys.107.125549 Planticonsortiaceae Tedersoo fam. nov. Type genus. Planticonsortium C. Walker & D. Redecker. Description. Emanating hyphae 0.5–4 μm diam., forming colourless to brown chlamydospores (10–12 μm, up to 35 μm diam.), sometimes rope-like strands; appressoria swollen, frequently with several thin hyphae giving an insect-like appearance. Intraradical mycelium 0.5–4 μm diam., smooth to angular, with (sub-) globose swellings, forming comb-like (ctenoid), fan-shaped, palmate, antler-like, digitate or feather-like structures appearing clasped around epidermal and cortical cells; forming finely branched arbuscules. All hyphae stain darkly in acidic blue stains, more strongly for extraradical hyphae. Monophyletic group in Densosporales (Fig. 2 , Suppl. materials 3 , 4 ). Notes. Planticonsortiaceae covers roughly one third of Endogonomycetes reads based on LSU (Suppl. material 3 ) and SSU (Suppl. material 4 ), but is poorly represented in the ITS dataset. This may be due to the highly divergent and relatively long ITS region (800–1200 bases). Based on the LSU phylogram, Planticonsortiaceae harbours seven genus-level groups with> 100 putative species. The description is adapted from Walker et al. (2018) .