Why were some of Schwann and Schleiden’s ideas about cells incorrect

One of Schwann and Schleiden’s ideas was that cells were originated by spontaneous generation, which was later rejected by Virchow.

Explanation:

Schwann studied animal tissues, and by observing them, he concluded that tissues were made of cells.

Simultaneously, Schleiden arrives at the same conclusion when studying vegetable tissues.

Around 1830, they met and together proposed the first cell theory. The theory stated that:

Virchow, who studied human tissues, during his observations sow the cell in its dividing process. He then proposed that cells were not originated from spontaneous generation, but they were the product of other pre-existing cells and were originated by cellular division. He rejected the third state of Schwann and Schleiden’s ideas.