noun
: one of the cells produced by the first division of the microspore in a gymnosperm and believed to be a vestige related to the fern prothallus
noun
: one of the cells produced by the first division of the microspore in a gymnosperm and believed to be a vestige related to the fern prothallus
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012