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. 2019 Jul 16;9:10318. doi: 10.1038/s41598-019-46560-7

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Morphology of selected Mucor hiemalis strains from sulfidic spring water microbiomes. (A) Adaptation and in situ morphology of mercury-accumulating M. hiemalis strain EH8 (F) attached to a moss leaf. (B) Laser scanning and stereo microscopy revealed similar morphology (S: sporangium, P: sporangiophore) of M. hiemalis EH5, EH8 and EH10 strains. (C) Detailed morphology and adaptation of aquatic M. hiemalis strains. The brush-like morphology of EH11’s in situ microbiome fixed on rock (F, C.1) from the methane–emitting salty sulfidic environment of Künzing spring and of EH8’s ex-situ grown microbiome fixed on expanded clay spheres (C.2) is visible. EH11 (C.3, sporangium S with sporangiophore P) showed spring-like hyphal morphology (C.4 and C.5) due to adaptation to bubbling methane. However, the spring-like hyphal morphology of EH11 disappeared after further cultivations on solid malt extract-agar medium.