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"B" movie from '50s or '60s: House with a cellar connected to cavern. There's a fungus that turns people into monsters if they touch it. Several people have been "eaten" or "absorbed" by the fungus.

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"The Unknown Terror" (1957)?

Here is a plot summary from IMDb.

A woman leads an expedition into a remote jungle to find her long-lost brother, but instead finds a mad scientist who has created a fungus monster that feeds on the local inhabitants.

Here is the complete movie from YouTube.

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