prothallus


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Related to prothallus: sorus, indusium, homosporous

prothallus

a small thalloid structure produced by the germination of the spore in ferns and related plants, which bears the ARCHEGONIA and ANTHERIDIA and is the GAMETOPHYTE generation.
References in periodicals archive ?
Further studies on the prothallus, embryo, and young sporophyte of Tmesipteris.
This species is characterized by a usually conspicuous black prothallus and a diffusely areolate, dark grayish thallus.
Gravity does not appear to have an independent effect on the later events of prothallus and secondary rhizoid growth in the gametophyte, for the growth of prothallial cells follows the same direction as that of the first prothallial cell, and the growth of secondary rhizoids follows the same direction as that of the primary rhizoid, no matter how the gametophyte is oriented.
During the second week after sowing, the large cell divides to form a filamentous prothallus of 4-5 cells, while new rhizoids emerge.
The prothallus bears the female (archegonia) and male (antheridia) organs.
Kuhn): the germination of the spore, and the development of the prothallus and the young sporophyte.