Acaulospora spinulifera sp. nov. forms spores, which are (74–)84–98(–107) × (73–)77– 93(–98) μm in diameter, yellow brown to brown and ornamented with crowded fine spines formed on the surface of the second, structural, and yellow
brown spore wall layer. Phylogenetically, the new species is close to A. baetica, A. cavernata, A. ignota, A. nivalis, A. paulinae, A. punctata and A. sieverdingii, but not to the morphologically more similar species A. spinosissima, A. spinosa
or A. tuberculata, that all form larger spores than A. spinulifera. In the A. sieverdingii/paulinae clade, in which currently species with pitted spore surfaces prevail, A. spinulifera is the second species with projections on the structural spore wall layer, besides A. ignota. The latter has warty to flattened elevations in irregular distances on spore surface, which might disappear with age, while the elongated to pointed spines of A. spinulfera are firm and persistent. The new fungus was found in two Cerrado savannas, an Atlantic rainforest,
a Caatinga/Cerrado transition zone, and in a soybean production site within the Cerrado.
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ARBUSCULAR MYCORRHIZAL FUNGI;
Document Type: Research Article
Publication date: August 1, 2017
This article was made available online on February 8, 2017 as a Fast Track article with title: "Acaulospora spinulifera, a new arbuscular mycorrhizal fungal species from the Brazilian Cerrado and Atlantic Rain forest".
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Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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