prothallus

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Related to prothallial: generative cell, Tube cell

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 ?
Laminar phase: According to our observations, prothallial development for A.
The meristem is established laterally, more towards the basal end of the prothallial plate than towards the apex.
In fact, a single prothallial cell may give arise to many gemmifers each of which generates one or more gemmae.
In most homosporous ferns, spore germination produces a primary rhizoid, followed by a germinal multicellular filament subsequent prothallial development based on the plane of cell division, and in the direction of the growth of the rhizoid and prothallial cell, this pattern of development was observed in A.
speciosum (Stokey & Atkinson, 1952) in morphology and development, but there are minor differences especially with regard to the development of a prothallial plate.
danaeifolium prothallial development is of the Ceratopteris-type; in this type of development, the meristem established laterally in young gametophytes is asymmetric (lopsided), for a shorter period during its development; all species in this study shared this character.
B: first stage of germination, with one rhizoid and a perpendicular first prothallial cell, 11 days.
The prothallial cell underwent periclinal divisions giving rise to 2-6-cell-long uniseriate filaments.
Plate phase formation began between days 20-40 with an orientation change in the division plane of the apical cell, showing a variation in the prothallial development pattern.
Hair abundance varies among species and depends on the stage of prothallial development.
Morphological differences in the sporophytes such as monomorphic and dimorphic fronds and size of spores, seemingly share a similar pattern of germination and development prothallial, and gametophytes of Blechnum are not sufficiently known to provide information for an adequate infrageneric classification (Table 2).