the Colony of Western Australia. 
559 
283. Ptilota siliculosa, n. sp. ; fronde complanata costata, decomposite ramosissima, ramis majori- 
bus alternis sparsisve, minoribus linearibus pectinato-pinnatifidis, pinnulis e basi lato sub- 
ulatis alternis simplicissimis; tetrasporis in glomerula siliouliformia e pinnularum latere 
superiore enata congestis, ad fila callithamnoidea brevissima circnmaximverticillataafiixis. 
Eottnest, rare (243). Very like the preceding inhabit; but evidently ribbed, and rather 
inciso-pinnatifid than pinnate, and not obviously transversely striate ; and abundantly cha- 
racterized by the strangely metamorphosed fructification. 
284. Thamnocaepus Gunnianus, Harv. Common at Garden Island and Eottnest; but not in fruit 
(169). 
285. Geiffitiisia ovalis, n. sp. ; fronde erecta (sub-bi-unciali) di-tri-chotoma subfastigiata crassis- 
sima, segmentis erecto-patentibus, articulis diametro 3-4-plo-longioribus, inferioribus cla- 
vatis, niediis superioribusque obovatis inflatis ad genicula maxime constrictis ; fertilibus 
conformibus; involucris tetrasporarum circa genicula involucratis e ramellis minimis con- 
flatis. Parasitical on Zostera, King George’s Sound (41). Also sent by Dr. Curdie, from 
Cape Northumberland. Very much more robust than G. corallina, with nodes contracted 
like those of an Opuntia. It is as robust as Chylocladia articulata. 
286. Geiffithsia mowi'hs, n. sp. ; fronde basi radicante cajspitosa (1-2 unciali) dichotoma fasti- 
giata orassissima, segmentis erecto-patentibus; articulis diametro sesquilongioribus globoso- 
inflatis siccitate sub-collapsis et ovalibus ad genicula maxime constrictis; fertilibus confor- 
mibus, involucris tetrasporarum circa genicula verticillatis. Parasitical on Algce at Garden 
Island, and on Zostera at Eottnest (326). When fresh it resembles beautiful strings of 
ruby-coloured beads, but fades much in drying. 
287. Geiffithsia Binderiana, Sond. ! Garden Island on Algce, Eottnest on Zostera (199). 
288. Geiffithsia Teges, MS. Cast ashore at Fremantle (146). I do not describe this species, as 
the fruit is unknown. It forms enormous, coarse, mat-like strata, one or two feet in breadth, 
composed of filaments resembling those of G. secundijlora, but very irregularly branched. 
289. CORYNOSPOEA australis, n. sp. ; fronde (biunciali) setacea gelatinoso-membranacea dichotomo- 
decomposita et alterne ramosa, ramulis pluries dichotomis, articulis longissimis ad geni- 
cula nec contractis, ramellis superioribus tenuissimis dichotomis, apicibus longe filiformi- 
bus arachnoid eis ; tetrasporis ad genicula ramorum majorum subsessilibus oblongis nucleo 
indiviso. Eottnest, in June, very rare (344). Fremantle, July, G. Clifton, Esq. A very 
distinct species, readily known by its attenuated apices. 
290. CoETNOSPOEA graciUs, n. sp. ; fronde pusilla (unciali) tenui alterne ramosa v. subdichotoma, 
ramulis quoquoversum egredientibus inferioribus furcatis superioribus bis-terve dichotomis, 
apicibus subattenuatis obtusiusculis; tetrasporis... ? Garden Island, rare, July (266). 
The habit and substance of the plant are those of Corgnospora. 
291 . Callithamnion Thw. MS.; filo primario repente, secundariis erectis osespitosis 
capillaribus (l-lg uncialibus) vage ramosis, ramis minoribus seepissime secundis filiformi- 
bus simplicissimis acuminatis ; articulis diametro 3-5-plo-longioribus cylindraceis ; tetra- 
sporis circa genicula suprema ramorum verticillatis pedicellatis, pedicellis ramosulis thyr- 
soideo-paniculatis ; favellis in ramulo terminalibus involucratis. On Algos and Zostera 
