OF SOUTH AUSTRALIA. 
201 
A. — Frond from the base broad, 3 mm. to 4 mm., and palmately spread- 
ing in repeated dichotomies, apices rounded, blunt. Ten cm. to 15 cm. 
in height and spread. 
R. foliifera Harv. and R. australis (Sond.) Harvey. I cannot dis- 
distinguish them. 
B. — Frond from the base narrow, 1 mm. to 2 mm., flabellate in dichoto- 
mies. Apices less blunt. Six cm. to 10 cm. long. 
R. leptophylla J. Ag. and R. linearis J. Ag. Kylin is at a loss to nar- 
narowly characterize the latter. 
C. — Frond with a narrow cuneate-linear stipe, dichotomo-fastigiate, proli- 
ficating again and again from truncated apices. Ten cm. to 15 cm. long. 
R. prolificans Zan. “Perhaps only a variety of R. australis” De Toni. 
Very many stems, erect, at base filiform, soon canaliculately flat, 
passing into a very narrow, 1.5 mm. frond. Older plants beset 
with strap-shaped marginal processes. About 15 cm. long. 
SEBDENIA Berthold. 
Frond compressed flat, sometimes laxly tubulose, forked or irregularly 
Jaciniate or lobed, rather thick and rigid. Interior stratum of more or less 
loosely packed branching articulate fibres; surrounded by a context of 
several series of cells. Cystocarps scattered, small and but little project- 
ing above the surface of the frond. Tetrasporangia nidulating among the 
cells of the cortex, cruciately divided. 
Sebdenia holly menioides (Harv.) De Toni. 
Frond broadly expanded above a stipe, thinly membranaceous, flat, pro- 
foundly incised, the thicker margin beset with minute glands. 
GLOIOSACCION Harvey. 
Frond bag-like, filled with transparent gelatine, rising from a short 
cylindrical stipe which is attached by a small conical disc. Composed of 
three strata; the inner of very large gelatinous cells soon ruptured to leave a 
cavity ; the intermediate of roundish-angular coloured cells ; the cortical of 
minute cells set in vertical filaments. Cystocarps immersed in the inter- 
mediate stratum and composed of numerous confluent nucleoli. 
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