Category Archives: Volume 60(1-2) 2022

Observations of the impact of bushfire on a community of myxomycetes

Authors: Stephenson, Steven L. & Elliott, Todd F.
Journal: Karstenia, Volume 60 (2022), Issue 1-2, pages 10-17.
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Key words: microbial ecology, moist chamber cultures, Amoebozoans, fire ecology, bushfires, slime molds

Abstract: In this study, we examined the impacts of a bushfire on a community of myxomycetes (also known as plasmodial slime moulds or myxogastrids) in northeastern New South Wales, Australia. Using the moist chamber culture technique, we prepared 40 moist chamber cultures from four different substrates. We collected the same four types of substrates on either side of a fire line approximately six months post-fire in order to assess what impact fire had on the myxomycete communities. Sixty percent of moist chamber cultures yielded evidence (plasmodia or fruiting bodies) of myxomycetes representing eleven species in eight genera. But only 40% of samples from the burned site were positive for myxomycetes, and only one species produced fruiting bodies. In contrast, 80% of samples from the unburned site were positive, and all eleven species were recorded. These data suggest that fire reduced the abundance and diversity of the myxomycete community at our site.

Amanita indogrisea, a new species of Amanita subg. Amanitina sect. Roanokenses from India

Authors: Kumar, Anil & Sharma, Roshi & Verma, Komal & Mehmood, Tahir & Sharma, Yash Pal
Journal: Karstenia, Volume 60 (2022), Issue 1-2, pages 1-9.
Full text: PDF
Key words: Amanita, Jammu & Kashmir, new taxon, nrLSU, taxonomy

Abstract: Amanita indogrisea is described here as a new species from coniferous forests in the Union Territory of Jammu and Kashmir, India based on morpho-anatomy and molecular data. This species is characterized by its small to medium-sized basidiomata, ash grey to lilac-grey pileal surface with ash grey to greyish brown pulverulent-floccose to felted veil remnants, ash grey to greyish-white stipes with ovoid to ellipsoid basal bulb, ellipsoid to elongated basidiospores (10.5–15.0 × 7.0–10.0 μm) and the absence of clamps in all tissues. Molecular phylogenetic analysis based on nuclear ribosomal large subunit (nrLSU) sequences confirmed its identity as a new species nested within A. subgen. Amanitina sect. Roanokenses. Description of the new species is provided in this study.