Hi Alacali,

It looks like you are over -watering your pothos. When you brought the pothos indoors, it did not need as much water as when it was outdoors. As the excess water built up in the soil, roots began to die and black areas started to appear on the leaves. Try taking the plant out of the pot and checking to see how wet the soil is at the very bottom. If the soil is wet, get rid of all the wet soil and allow the plant to lay out, bare root, over night. Repot in dry soil and place your pothos in a warm area that gets bright indirect lightVery few houseplants should be placed in direct sun. High light refers only to bright indirect light since direct sun often burns the leaves of indoor houseplants. An area that is too hot and dry encourages Spider Mites and causes blooms to quickly fade. A northern exposure really doesn't provide enough light for high light plants. These plants need to be placed directly in front of an east-facing window, within 1-3 feet of a west-facing window, and within 5 ft. of a south facing window. A high light area has over 300 ft. candles of light.. Do not water until the leaves get soft and start to droop a little.

Temperature may also be a problem. Pothos plants do well in temperatures between 55° and 80°F (12.8°-26.7°C). If temperatures drop below 45°F (7.2°C), a pothos plant stops growing and the leaves turn black, but it is usually the entire leaf that turns black.