Pinthanatos fuscimalus
As the population of Fungera primus grew, a scene of competition began to form. Particles to eat, which started out extremely common due to being a previously untapped market, became less and less numerous. In the midst of this, several fungi began to evolve ways to edge-up or completely avoid the competition. While some species grew to avoid this competition, like Fungera currufractulus, others found ways to edge-up. One of these F. primus groups ended up forming the species Fungera fuscimalus
This Synaplotan, when decomposing organic materials, uses an enzyme (often called Fuscimalase) that F. fuscimalus is immune to, but its relatives are not. This enzyme often gets leaked out to the soil around it, and Fuscimalase does not easily degrade. This is causing certain locations to be lethally toxic to any fungus, causing a very sudden drop in there population in anywhere besides the outer limits of zone 4 and certain untouched locations. Its relatives are not completely doomed, however. Fuscimalase doesn't work well in temperate waters or cooler, and certain groups are individually evolving resistance to Fuscimalase.
It is exclusive to zone 4, and is typically between 7-12 μm in terms of zoospores. The mycellial network typically grows smaller then its ancestor (the highest seen is 3 millimeters, and it typically doesn't grow larger then one) due to energy for growth being used for Fuscimalase.