OF SOUTH AUSTRALIA. 
411 
Dilophus J. Agardh. 
D. fastigiatus (Sond.) J. Agardh. Eastern Bays, 
Encounter Bay, Holdfast Bay, Investigator 
Strait. 
D. marginatus J. Agardh. Encounter Bay. 
Lobospim Areschoug. 
L. bicuspidata, Areschoug. Eastern Bays, Encoun- 
ter Bay, Investigator Strait. 
(B) IIETEROGENERATAE Kvlin 1933.— Morphological alternation of 
dissimilar generations known or inferred to be present, with the 
gametophyte reduced to microscopic size. This class is generally 
divided into the two sub-classes Haplostichineae and Polystichineae, 
but some workers believe this division is rather artificial. 
(a) HAPLOSTICHINEAE (Kuckuck) Kylin 1933.— The sporophyte 
shows trichothallic growth, the thallus being composed of 
filaments, free from one another, interwoven, or densely com- 
pacted into a pseudo-parenchymatous thallus. The microscopic 
gametophyte is either isogamous (i.e. y produces isogametes) or 
bogamous (i.e., reproduces by production of sperms and eggs), 
while the macroscopic sporophyte may produce zoospores or 
aplanospores. There are three orders. 
(i.) Chordariales Setchell and Gardner 1925. — Sporophytes 
are trichothallic and composed of filaments not markedly 
compacted into a pseudo-parenchymatous thallus, but 
generally of adherent branches. Gametophytes are 
microscopic, monoecious, and isogamous. There are three 
families. 
Chordariaceae (Reichenbach) Setchell and Gardner 
1925. 
Leathesiaceae Setchell and Gardner 1925. 
Leathesia Gray 1821. 
L. difformi s Areschoug. Encounter Bay. 
Corynophloea Kiitzing. 
C. cystophorae J. Agardh. Encounter Bay. 
(ii.) SPOROCIIXALES. — Sporophyte consisting of a number 
of adherent filaments of cells, each branch terminating 
in a tuft of hairs; sporangia borne terminally, usually 
in dense clusters;* microscopic gametophyte monoecious 
and oogamous (i.e., produces sperms and eggs). There 
are six genera with about 25 species. 
Sporochnaceae (Reichenbach) Decaisne 1842. 
Sporochnus C. Agardh. 
S. comosus C. Agardh. Eastern Bays, Encounter 
Bay, Investigator Strait, 
