Two new species of Amanita sect. Phalloideae from Africa, one of which is devoid of amatoxins and phallotoxins

Summary

This research describes two new species of mushrooms from Africa belonging to a group that includes some of the world’s deadliest mushrooms. One interesting discovery is that while one species (A. bweyeyensis) has genes for producing deadly toxins, it doesn’t actually produce them and is safely eaten by local people. However, the researchers warn that both species should still be considered potentially deadly since they carry the genetic machinery for toxin production. Impacts on everyday life: – Highlights the importance of proper mushroom identification for safe foraging – Shows how traditional knowledge of edible mushrooms can lead to scientific discoveries – Demonstrates that genetic potential for toxicity doesn’t always mean a mushroom is poisonous – Advances our understanding of how mushroom toxins evolve and develop – Emphasizes the need for caution when consuming wild mushrooms, even if they appear similar to known edible species

Background

Most representatives of Amanita sect. Phalloideae are famous worldwide for their high, often deadly, toxicity. The section comprises nearly 60 described species, with many recently described from Asia. Very few species belonging to sect. Phalloideae have been recorded from Africa and Madagascar. Most of African mycodiversity remains under-explored with only ca. 1500 taxa described to date.

Objective

To describe and characterize two new species of Amanita sect. Phalloideae discovered in tropical Africa based on morphological and molecular data. To analyze their toxin content and genetic capacity for toxin production.

Results

Two new species were described: Amanita bweyeyensis and A. harkoneniana. A. bweyeyensis grows in association with Eucalyptus and lacks amatoxins and phallotoxins despite having the gene sequence for phallacidin production. A. harkoneniana was found in Miombo woodland and gardens. Both species formed a well-supported clade in phylogenetic analyses, distinct from other known African Amanita species.

Conclusion

The discovery of these two new African Amanita species expands our knowledge of sect. Phalloideae diversity. The presence of toxin genes but absence of toxin production in A. bweyeyensis represents the first such case in Amanita and provides insights into toxin evolution. However, both species should still be considered potentially deadly poisonous due to their genetic capacity for toxin production.
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