In the Florideae, Lichens and Laboulbenjaceae the, male cell is a non-motile spermatium, which is carried to the female organ.
In favour of the conidial view is the fact that in the case of Collema and a few other forms the spermatia have been made to germinate in artificial cultures, and in the case of Calicium parietinum Moller succeeded in producing a spermogonia bearing thallus from a spermatium.
Only when a spermatium was found attached to the trichogyne did the further development of the ascogonium take place.
From these observations he drew the natural conclusion that the spermatium was a male, sexual cell.
B, Apex of the trichogyne with the spermatium, s, (X405) attached (>0125).
Fertilization is effected by the passive convection of a spermatium from the antheridium to the trichogyne, to which it adheres, and to which it passes over its nucleus through an open communication set up at the point of contact.
It is singular that in the last-named species two nuclei occur regularly in the spermatium.
The male cell is a spermatium, but the female cell bears no such receptive trichogyne as occurs in other Rhodophyceae.
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