OF SOUTH AUSTRALIA. 
131 
NEMALION Targioni-Tozzetti 1818. 
Frond terete or slightly compressed, soft and slippery, simple or fur-, 
cately branched, composed of an axis of closely interwoven filaments 
surrounded by a zone of loose, anastomosing branched filaments, giving 
off laterial di- or triehotomous corymbose fascicles of peripheral chromato- 
phore-bearing moniliform filaments. Spermatangia hyaline, near the 
apices of modified peripheral filaments. Carpogenic branches terminal as 
divisions of the peripheral filaments, immersed, usually three-celled, the 
upper forming the earpogonium; gonimoblasts formed from the upper of 
two cells formed after fertilization, the lower cell fusing with the rest of 
the carpogenic branch to form a nutritive cell; gonimoblasts radiating in 
a spherical mass, the end cells producing carpospores. 
Nemalion lielminthoides (Velley 1792) Batters. 
= Nemalion lubricu/m Duby. 
Thallus simple or once divided at the base, 5 cm. to 20 cm. long, 1 mm. 
to 4 mm. broad; very elastic, firmly gelatinous, brown or reddish-brown. 
Thallus structure typical for the genus; cells of moniliform assimilating 
filaments elongate-ovoid, with gelatinous sheath, 14 to 24 /x long by 7 to 
15 n broad. Carpospore masses just immersed in periphery of thallus, 
spherical, 60 to 80 /x across; carpospores spherical to ovoid, 4 to 8 /x 
across. 
Fig. 7 , —Nemalion helminthoides (Velley) Batter*, a. Adult thallus; b , transverse 
section of thallus, showing central core and peripheral branched filaments; 
c, peripheral moniliform filaments, with carpogonia and trichogynes; 
d, carposporangial mass. Fig. H.B.S.W. 
