Splitting and filling the gaps: a reorganization of Corymbiglomeraceae and new taxa from trans-Pacific tropical regions
This study reorganizes the fungal family Corymbiglomeraceae by describing new genera and species from Mexico and French Polynesia, confirming the phylogenetic split of the genus *Redeckera* into distinct lineages including *Albocarpum* and *Pulvinocarpum*, while proposing a sporulation dimorphism in *Albocarpum* and identifying potential new families and genera within the order Diversisporales based on morphological and molecular analyses of eDNA sequences.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of a preprint that has not been peer-reviewed. It is not medical advice. Do not make health decisions based on this content. Read full disclaimer
Imagine the world of fungi as a massive, bustling library. For a long time, scientists thought certain books (fungus species) belonged in a specific section called the "Diversisporales" family. Recently, librarians (scientists) realized the catalog was a bit messy and needed a major reorganization. They decided to split this section into two smaller, more organized rooms: the "Diversisporaceae" room and the "Corymbiglomeraceae" room.
This new study is like a team of detectives traveling to Mexico and French Polynesia to find new books for this library. They didn't just look at the covers; they used both a magnifying glass (looking at the physical shape of the fungi) and a DNA scanner (reading their genetic code) to figure out exactly who they were.
Here is what they discovered, explained simply:
1. The Great Split of "Redeckera"
One specific group of fungi, previously known as the genus Redeckera, was like a family where everyone was forced to live in the same house, even though they were actually very different people. The study found that this "house" actually contains three distinct families that need to move into their own neighborhoods:
- The New Neighborhood "Albocarpum": This is a brand-new genus (a new family name). They found three new "residents" here: two completely new species and one that was moved from the old Redeckera house.
- The New Neighborhood "Pulvinocarpum": Another brand-new family, with just one resident found so far.
- The Renamed "Redeckera": The original name stays, but the house is now much smaller, keeping only five species (including one new discovery).
2. New Residents Found
Beyond splitting up the old family, the team found two completely new characters that didn't fit anywhere else:
- A new fungus named Melanocarpum mexicanum (a new genus and species).
- A new type of Diversispora called Diversispora papillosa.
3. The Mystery of the "Double Life"
One of the most interesting clues came from the new Albocarpum family. Some of these fungi build huge, impressive "fruiting bodies" (like a giant mushroom cap), while others in the same family just scatter their spores in loose piles. It's as if some family members are professional architects building castles, while others are just tossing bricks in a pile. The scientists suggest this "split personality" (dimorphism) might be why some fungi were previously confused about where they belonged in the family tree.
4. Mapping the World
Using digital maps and environmental DNA (tiny genetic traces left in the soil), the team tracked where these fungi live. They found that most of these new discoveries are "pantropical," meaning they live in the warm, tropical zones all around the globe. However, some seem to be rare or even "homebodies" that only live in very specific, small areas.
5. What's Next?
The study also hinted that there are still more mysteries to solve. The DNA data suggests there might be a whole new "family" and two more new "genera" waiting to be discovered. But, just like a detective waiting for a witness to appear, scientists need to actually find the physical fungus (the "morphospecies") before they can officially name and describe these new groups.
In short, this paper is about tidying up the fungal family tree, moving confused relatives into their correct homes, and discovering new neighbors in the tropical world, all while realizing that some fungi have more than one way of showing off their spores.
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