prothallus
noun
pro·thal·lus
| \ (ˌ)prō-ˈtha-ləs
\
\
Definition of prothallus
1
: the gametophyte of a pteridophyte (such as a fern) that is typically a small flat green thallus attached to the soil by rhizoids
2
: a greatly reduced structure of a seed plant corresponding to the pteridophyte prothallus
Illustration of prothallus
prothallus 1: 1 antheridium, 2 archegonium, 3 rhizoid
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