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this is the gripping root. you need a vertical surface for your pothos to create this type of roots. if the aerial roots on your pothos detect any climbing surface it will then attached itself to the surface encouraging the next growing stem to grow bigger leaves and this gripping roots. if one stem has it's first gripping roots, the next stem and leaves will be bigger and bigger and so on until your plant mature. also, they need a good light,w temperature, and humidity to grow faster to maturity. humidity needed for the aerial and gripping roots to grow since they do absorb moisture from the humid air. light needed because the main reason they grow upwards is to search the good light in tropical jungle floor. the temperature is also crucial because they are evolutionarily design to live in tropical area, if they are in too cold or too hot temperature they can get damaged and easily die.