SEXUAL REPRODUCTION OF THALLOPHYTES., 319 
closed hair-like body—the Trichogyne. The antherozoids 
attach themselves to this. A further development of the basal 
a 
Fic. 12.—Diagrammatic representation of the development of the sporocarp in 
Coleochete ; a, carpogonium with antherozoid (m); 4, fertilized carpo- 
gonium invested with its pericarp (after Pringsheim). 
cell of the carpogonium results ; it increases in circumference, 
divides into numerous cells, which grow out into closely 
crowded shoots; at the end of each a spore developes. The 
aggregate of the spores, with their short pedicles, constitute 
the sporocarp, which is in Nemalon destitute of a pericarp. 
Nemalion is the simplest type of the Flor:dez. In others 
(Ceramiee) the carpogonium, even before fertilization, consists 
of numerous cells (fig. 13, 5), a lateral row of which—the 
Trichophore—bears the trichogyne. Fertilization takes place 
as in Nemalion, but neither trichogyne nor trichophore take 
any part in the subsequent development. The sporocarp 
results from the growth and division of other cells of the 
carpogonium. The pericarp is produced by a process of 
budding from cells beneath the carpogonium.! 
In the genus Dudresnaya the process of fertilization 
becomes very complicated, and, in fact, involves a double 
process, of which the first stage consists in the application of 
antherozoids to a trichogyne, and the second in the develop- 
ment, from below the trichophore, of a “conducting fila- 
ment,” which conveys the fertilizing influence to the terminal 
cells of a number of small branches, with which it successively 
* The trichophore and trichogyne were discovered (1861) by Nageli; the 
sexual meaning of these structures was made out by Bornet and Thuret. 
(1866); see ‘ Ann. d. Se. Nat.,’ 1867, tom. vii, p. 137. The antheridia of 
the Floridee were discovered by Ellis in 1757. 
VOL. XV.—NEW SER. Y, 
