OF SOUTH AUSTRALIA. 
385 
Family NEMASTOMACEAE (J. Agardh) Schmitz. 
NEMASTOMA J. Agardh. 
Frond compressed, between fleshy and gelatinous, dichotomous, composed 
of two strata ; the medullary stratum of longitudinal, interwoven filaments ; 
the peripheric of dichotomo-fastigiate, articulate, filaments, lying in firm 
gelatine. Cystocarps immersed below the cortical filaments, containing fila- 
ments and numerous rounded spores ; cruciate tetrasporangia dispersed 
among the cortical filaments. 
Nemastoma (?) comosa Harvey. 
Frond very long, to 2 meters, linear, compressed, distantly forked; the 
segments elongate, simple, densely fringed with subdistichous or scattered, 
slender, filiform, basally and apically attenuated ramuli. Cystocarps and 
tetrasporangia both immersed in the ramuli of different plants. 
Attachment a small disc. Frond to 2 meters long; branches simple, to 
1 meter long. The axils rounded and apices attenuated; throughout the 
Fig. 194. — Nemastoma comosa : a, base of a six-foot 
long frond; b, segment of a transverse 
cutting of a ramulus, showing two 
favellae lying beneath the excurrent peri- 
pheric threads; c, some spores. (After 
Harvey.) 
