BY A. H. S. LUCAS. 51 



De Toni includes Sirophymlis binodis Kuetz.,(Tab. Phyc. x., 

 t.59, £.2) as C. muricatum var. binodis (Kuetz.). The description 

 is: " Fronds muricate; aculei rather lax, thickened at the apex, 

 bi- or tri-dentate, divaricate; vesicles in pairs, rarely threes, 

 lanceolate. Australia(Kuetzing)." I have not seen the type of 

 this variety, but individuals of our species seem to answer well 

 enough to this description. 



C. onustum(M ert.) J.Ag., Holdfast Bay, W.A (F. v. Mueller), 

 and Mus. Paris, and V. australe Sonder, Holdfast Bay (F. v. 

 Mueller) are nearly allied forms to C. muricatum. De Toni does 

 not list the latter, which is recognised by Harvey in his Syn. 

 Cat. T have not seen either. 



Hormosira Endl. 



H.(\) articulata(Forsk.) Zan. — I had the good fortune to dis- 

 cover this singular species, with its remarkable triquetrous stem 

 with interrupted alternate wing-expansions, growing on a rocky 

 shelf around a small island in the upper reaches of Port Stephens. 

 It was growing in company with Cystophyllum muricatum, and 

 could be gathered while wading at low tide. 



To make sure of my identification of this species, which is 

 known as a Red Sea species, possibly occurring also in the China 

 Sea, I submitted a specimen to Mrs. E. S. Gepp, who kindly 

 compared it with the specimens of H. articulata in the British 

 Herbaria. She confirms the identification. 



Judging from the distribution so far known, we may expect to 

 find this plant further north. Like C. muricatum, it appears to 

 affect the quieter waters of sheltered harbours. 



Notheia Bail. & Harv. 



K. anomala Bail, k Harv. — This interesting parasite is only 

 listed by De Toni from New Zealand and Tasmania. Harvey, 

 however, recorded it from the south coast of Victoria at Port 

 Fairy and Port Phillip Heads. I found it growing abundantly 

 at Barwon Heads, and J. Bracebridge Wilson at Western Port. 

 I have since traced it along the coast of New South Wales from 

 Twofold Bay to Port Stephens. It is evidently, then, widely 



