Ultrastructure of cyst-like fungal bodies in myxomycete fruiting bodies

Authors: Yajima, Yuka & Shigeki, Inaba & Degawa, Yosuke & Hoshino, Tamotsu & Kondo, Norio
Journal: Karstenia, Volume 53 (2013), Issue 1-2, pages 55-65.
Doi: https://doi.org/10.29203/ka.2013.458
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Key words: Nivicolous Lamproderma, plasmodial slime molds, Rozella, SEM, Stemonitaceae, TEM, arctic-alpine mycology

Abstract: This is the first report on ultrastructural observations of nivicolous myxomycete fruiting bodies with cyst-like bodies. One specimen had immature fruiting bodies of a Lamproderma sp. just after spore cleavage.  Using light microscopy and scanning and transmission electron microscopy, countless cyst-like bodies were observed inside of the developing spores, capilitum, columella and stalk. A second specimen consisted of mature fruiting bodies of L. echinosporum. Outward appearance of the fruiting bodies was normal with numerous cyst-like bodies inside the entire fruiting body. The cyst-like bodies n both myxomycete specimens have a common morphology: 5-6 µm in diam, being transparent under light microscopy and densely warted by SEM and TEM observation. The partial sequence of the 188 rDNA gene of the first specimen suggested that cyst-like bodies were in the Cryptomycota (including Rozellida), placed at the root of a fungal body.