noun Etymology: New Latin Date: 1854 the gametophyte of a pteridophyte (as a fern) that is typically a small flat green thallus attached to the soil by rhizoids, a greatly reduced structure of a seed plant corresponding to the pteridophyte ~
PROTHALLUS
Meaning of PROTHALLUS in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012