antheridium

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  • noun

Words related to antheridium

the male sex organ of spore-producing plants

References in periodicals archive ?
Mature antheridia attached to the nodal region of the thallus; shield cells are evident.
Nevertheless, our results suggest that neither system could be adduced to explain the irregular gametophytes in the current case: we can discard the existence of an antheridiogen system, as antheridia were observed only in well-developed, cordate gametophytes; and we can discard interspecific competence because our cultures were monospecific.
At times the number of perigonia or antheridia occurring within an age class reduced the female bias, especially in W.
The Phytophthora taxonomic system has been based on morphological characteristics of the globose oogonia with paragynous antheridia, chlamydospore, torulose hyphae and lemon shape of sporangia (Mchau and Coffey, 1995).
The taxonomic identification of Saprolegnia is traditionally done with a detailed description of morphological characteristics, especially sexual structures as oogonia, antheridia or ornamentation present on the walls of the oogonia.
Outer appendage greyish, with large basal cell bulging externally, followed by series of 3 or 4 gradually narrowing, superimposed cells, bearing dense tuft of elongate, brownish antheridia on inner side.
The pieces of baits from each vessel were observed every 3-4 days under a light-microscope and the presence of morphological structures (zoospores, antheridia and oogonia) of aquatic straminipilous organisms was recorded.
The aquatic-dwelling ancestry of the ferns is revealed by a reproductive system in which motile sperm are produced within the antheridia, swim to the neck of the archegonium, and fertilize the egg to produce a new diploid zygote (see Figure 14-3).
Sexual reproduction in the large brown seaweeds of the Laminariales, commonly called kelp, involves signaling chemicals, or "pheromones," that induce sperm release from antheridia and subsequent chemotactic orientation of sperm towards the luring eggs.
Gametophytes are unisexual, forming either archegonia (female) or antheridia (male).
Germination of Polypodium hirsutissimum spores and antheridia formation in darkness.
The antheridia developed after the archegonia, between day 60 and day 70 in most species, with the exception of Blechnum appendiculatum in which they developed after day 80 (Figs.
Eleven weeks age prothalli develop archegonia, while no antheridia are formed at all.