成唯識論述記 3.559

3.559

述曰：此解似種。本識變種，能生果故，名為真種。觸等與識同一所緣，故彼亦能變為種子，不能生果，名為似種。十九問彼，何故須然？二十彼答。

The Commentary states: This explains the semblance-seeds (sādṛśya-bīja). Because the seeds transformed by the root consciousness can produce fruits, they are called real seeds. Contact and so forth have the same cognitive object as consciousness; therefore, they can also transform into seeds, but they cannot produce fruits, so they are called semblance-seeds. Nineteenth, [the treatise master] asks him: Why must it be so? Twentieth, he replies.