The antheridia and oogonia are formed at the nodes of the appendages.
The sexual organs--oogonia and antheridia---are borne on special portions of the thallus in cavities known as conceptacles.
The oogonia arise on a stalk cell from the lining layer of the cavity, the contents dividing to form eight oospheres as in Fucus, four as in Ascophyllum, two as in Pelvetia, or one only as in Hallidrys.
The larvae only were collected, as they gave all the desired stages for a study of the spermatogenesis, and also oogonia and synizesis and synapsis stages of the oocytes.
Turning now to the female larvae to determine the somatic number, the oogonia proved to be more favorable for counting.
The constitutive membrane of the adult oogonia is reabsorbed in a great many points, and is there pierced with rounded holes.
The branches of the mycelium which do not bear oogonia apply their obtuse extremities against the growing oogonia; this extremity swells, and, by a transverse partition, separates itself from the supporting tube.
Probably they are more perennial in their character, and are assimilated more to the oogonia of Cystopus and Peronospora, being rather of the nature of resting spores, inasmuch as the same threads usually bear the terminal fruits.
In Botrytis and in Polyactis, the flocci and spores are similar, but the branches of the threads are shorter and more compact, and the septa are more common and numerous; the oogoniaalso are absent.
H] De Bary has claimed for the oogonia in Cystopus and Peronospora a kind of fecundation which deserves mention here.
During the formation of the oogonia there arise from its pedicel or from neighbouring filaments slight cylindrical curved branches, sometimes turned round the support of the oogonia, and which all tend towards this organ.
Similar oogoniaare produced amongst the Mucedines in the genus Peronospora, to which De Bary considers Cystopus to be closely allied.
Mycelium poorly developed or absent; oogonia and antheridia (without antherozoids) known in some cases; zoospores common: Chytridiaceae.
Mycelium present; antheridia but no antherozoids; oogonia with one or more oospheres: Peronosporaceae, Saprolegniaceae.
Sexual reproduction by oogonia and antheridia; asexual reproduction by zoospores or conidia.
Monoblepharis has oogonia with single oospheres and antheridia developing a few amoeboid uniciliate antherozoids; these creep to the opening of the oogonium and then swim in.
The Peronosporaceae reproduce themselves sexually by means of antheridia and oogonia as described in Pythium.
In the rotting tissues branches of the older mycelium similarly swell up and form antheridia and oogonia (fig.
Fungi with segmental thallus; sexual reproduction sometimes with typical antheridia and oogonia (ascogonia) but usually much reduced.
In Hydra the oocyte is a large amoeboid cell, which sends out pseudopodia amongst the oogonia and absorbs nutriment from them.
When the oocyte is full grown, the residual oogonia die off and disintegrate.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "oogonia" in a variety of sentences. We hope that you will now be able to make sentences using this word.
