Matango (1963) on Netflix

Shipwrecked survivors slowly transform into mushrooms.

A group of pleasure-seeking young people are stranded on a mysterious island when their boat crashes. One by one they succumb to the lure of the deadly mushrooms.

—Steve Hill <shill@harper.cc.il.us>

Five vacationers and two crewmen become stranded on a tropical island near the equator. The island has little edible food for them to use as they try to live in a fungus covered hulk while repairing Kessei's yacht. Eventually they struggle over the food rations which were left behind by the former crew. Soon they discover something unfriendly there...

—Scott Hutchins <scottandrewh@home.com>

A group of friends are sailing on the yacht when a storm blows them off course and damages the boat. They soon land on a deserted island where they find a deserted, fungus covered wreck. They then find out that it was a research vessel examining the effects of radiation on plant and animal life. However, they also discover a strange fungus dubbed Matango. They also find out that the crew ate some of the fungus and were somehow driven mad. The group then goes about trying to find food and water without succumbing to the lure of the mushrooms. However, one by one they soon are driven by their hunger and desires to eat the mushrooms with disastrous effects.

—Brian Washington <Sargebri@att.net>