antheridium

(redirected from antheridia)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

antheridium

[‚an·thə′rid·ē·əm]
(botany)
The sex organ that produces male gametes in cryptogams.
A minute structure within the pollen grain of seed plants.
References in periodicals archive ?
Although, the hermaphroditic gametophytes simultaneously possessed both antheridia and archegonia, bisexual gametophytes possessed antheridia that had already released their spermatozoids.
Mature prothalli of Cyrtogonellum fraxinellum produced both antheridia and archegonia at the same prothallium (Fig.
Many apomictic ferns possess antheridia but archegonia are usually absent (Manton, 1950; Walker, 1966; Liu et al.
We recovered evidence of the formation of functional antheridia, but only one species form archegonia.
Similarly, exogenous BAP reduced LW and delayed the production of both antheridia and archegonia in Blechnum spicant and endogenous levels of six cytokinins were higher in females than in males (Menendez et al.
Parametric ANOVA Groups df MS Antheridia / NDL Between 3 4.
The antheridia were sunken in the parenchymatous tissue that makes up the body of the cylindrical gametophyte.
Sunken antheridia with ellipsoidal or spherical masses of spermatocytes were illustrated by Lang (1902) and Campbell (1907).
The relative number of antheridia and archegonia in hermaphrodites, or the number of antheridia present in the male may change in response to nutrient levels in the environment.
The secondary gametophytes produced antheridia on their margins.
Most species of Polypodiaceae maintain an antheridiogen system through which the robustly growing female gametophytes induce production of antheridia precociously on the smaller gametophytes growing nearby, thus enhancing the probability of cross-fertilization (Chiou and Farrar, 1997).
Masuyama (1975b) recognized four basic locations of antheridia on monoecious prothalli: antheridia on the lower part of gametophyte thallus (type L), on the lower half of the wings (LW), on the lower half of the margin (type LM), on the upper half of the central cushion (type UC), or antheridia located all along the margin (type M).