14 Dansk Botanisk Arkiv, Bd. 2. Nr. 6. 



The new species has a somewhat intermediate position be- 

 tween C. nodosa and C. rotundata on one side, and C. serrulata on 

 the other. It differs from C. nodosa and C. rotundata in the well- 

 developed marginal teeth, the broader leaves and the open rings 

 (scars) on the stem, left by the leaf-sheaths ; besides the shape of 

 the drupelet is different. From C. serrulata, on the other hand, 

 it differs in the longer and narrower leaves and leaf-sheaths, the 

 lighter (pale purplish) colour of the sheaths, and the smaller 

 number (9 — 13) of nerves. The main difference from both lies 

 in the regularly tapering uppermost part of the blade and the 

 shape of the drupelet. 



It has in common with C. nodosa and C. rotundata the light 

 purplish colour of the sheaths, the number of nerves and the 

 slightly obconical shape of the sheaths ; in common with C. serru- 

 lata the well-developed marginal teeth and the open rings on the 

 stem left by the sheaths; these scars are closed (annular) in C. 

 nodosa and C. rotundata, which means that the sheath wholly 

 encloses the axis, while in C. serrulata and C. angustata a small 

 part of the circumference is free from the sheath. 



In morphology it does not differ in any important feature 

 from what we know about the morphology of C. nodosa, which 

 is well known through the investigations of E. Bornet 1 , Ch. Fla- 

 hault 2 and others. 



As to the geographical distribution, the new species is only 

 known from Carnarvon, but I think it probable that Dr. Nau- 

 mann's plant was also C. angustata, and not C. rotundata. 



I have seen C. rotundata from the Red Sea, Madagascar, An- 

 damans and Nicobar Islands, Java, the Philippines and Queens- 

 land (Port.Denison, leg. Fitzalan, in the National Herb, of Victoria) 

 and P. Ascherson (Geogr. Verbreit. Seegräser (1905) 398) gives 

 further: Timor, Anachorete Isis., New-Hannover and New-Mecklen- 

 burg. Perhaps some of the Melanesian records should be placed 

 under the new species. The same uncertainty rules with regard 

 to C. serrulata, specimens of which I have seen from the Red Sea, 

 the East coast area of Africa, Ceylon Strait, the Philippines, New 

 Guinea and from Queensland, and Ascherson (1. c.) has the further 

 records: Singapore and New Caledonia. It will be necessary to 

 re-examine each of these records in comparison with C. angustata. 



1 E. Bornet, Recherches sur le Phucagrostis major Cavol. — Ann. sc. 

 nat. Botanique, V ser., t. 1, 1864. 



2 Ch. Flahault, Cymodocea, in Kirchner, Loew u. Schroeter: Lebens- 

 geschichte der Blütenpflanzen Mitteleuropas, Bd. 1, Abt. 1 (1908) 529. 



