OF SOUTH AUSTRALIA. 
393 
LITHOPHYLLUM Philippi. 
Frond dorsiventral, flat, variously marked or figured, thickly crusted 
with lime, more or less affixed, margin free or loosely adhering, with many 
stromae. Conceptacles as in Melobesia, . Conceptacles of the sporangia 
immersed or slightly prominent, convex in the central part of the cover- 
ing, then more or less ecorticate, and finally subdepressed. Conceptacles 
of the carpospores immersed or slightly prominent, with a short paraphysis 
in the central fascicle of the carpospores. 
Lithophyllum hyperellum Foslie. 
Frond 2-5cm. diameter, sometimes affixed, other times free, sub globose, 
repeatedly and irregularly branched from the centre; ramuli radiating, 
short, nodose, very dense, fastigiate, apices often dense. Conceptacles of 
the sporangia at first convex, not definitely acute, solitary or in small 
clusters. Tetrasporangia zonately divided. 
Victoria (Port Phillip, Western Port). 
Lithophyllum amplexifrons (Harv.) Heydrich. 
Frond loosely twisted, thick lobate, rugose. Conceptacles very small, 
immersed, umbilicate, almost porous. 
South Australia (Eastern Bays), South Africa. 
GONIOLITHON Foslie. 
Frond lithophyllic ; heterocysts numerous in the thallus or scattered here 
and there. Conceptacles of the sporangia are superficial or subimmersed, 
conical, with elongate apices, or constricted above the middle; the upper 
part of the sporangia is often cut off when ripe, and the conceptacles are 
then hemispherical or conical, furnished with a thick apical pore. Sporangia 
supported on a long pedicel, rising from a somewhat flattened disc at the 
base; the discs joined by a covering of very fine filaments, often disappear- 
ing when fully developed. Conceptacles of the carpospores, superficial, 
conical, apices often elongated into a thick apical pore. 
Goniolithon verrucosum Foslie. 
Frond irregularly erustaceous, verrucose. Conceptacles of the sporangia 
very dense over the whole surface, hemispherical, or hemispherical-conical. 
South Australia (Robe). 
Goniolithon elatocarpum Foslie. 
The crust is indeterminate, 10 mm. to 15 mm. in diameter, 2 cm. to 4 cm. 
thick, often slightly verrucose. Conceptacles of the sporangia have elongate 
apices, which soon fall off; hemispherical-conical. 
Victoria (Western Port). 
AMPHIROA Lamouroux. 
h rond terete, compressed or flat, calcareous, articulated, dichotomous, 
pinnated or whorled. Nodes cartilaginous. Conceptacles conical, wart- 
like, sessile on the disc of the articulations, furnished with an apical pore, 
and containing in the base of the cavity a tuft of erect, pyriform, at length 
four-parted spore threads. 
