F. Børgesen: Rhodophyceæ of the Danish W. Indies. 



57 



!^ 



In "Forschungsreise S. M. S. »Gazelle«", IV part, Bot., p. 31 

 AsKENASY has described the Acrochsetium [Chantransia) Naumanni 

 in which the sporangia seem to have a similar thickening of the 

 membrane at their summit as in the present species, but in its 

 whole appearance and in its way of growing, quite or nearly 

 quite immersed in the host plant, it is very different from my 

 plant. The Acrochsetium {Chantransia) interpositum Heydrich^) 

 must be identical with Askenasy's species and is in any case 

 highly distinct from my plant. Finally as to Callithamnion poly- 

 rhiziim Harv.^), this plant also seems to be very 

 different, Mr. A. D. Cotton has most kindly 

 examined for me a little fragment of the ori- 

 ginal plant of Harvey. From this it is evident 

 that Harvey's plant is much larger and quite 

 different from the mine having much likeness 

 to Rhodochorton. 



Of species not found in Codiiim our plant 

 has some likeness also with the Acrochsetium 

 {Callithamnion) N emalionis De Notaris of which 

 a very detailed description is given by Ro- 

 senvinge (1. c. p. 126). But Acroch. Nemalionis ^ « 

 has, as described by Rosenvinge, "long rami- f-^^- ^'^,- ^^tocä«- 



. ■ , 1 ■ 1 • tiuin phacelorhizuin 



lied filaments growing widely m the interior of nov.spec. a, filament 



with sporangia. 



the host and here and there sending out through 

 the surface of the host free filaments giving 

 rise to new tufts." This I have not found in 

 my plant. And further in Acrochsetium Nema- 

 lionis the sporangia are borne on branchlets 

 while all I have seen in my species were sessile 

 ces to which several others can be added show that my plant is 

 very different from that of De Notaris. 



This species has been found at the shores of St. Croix: Coakley Bay 

 {in Codiuin isthmocladum) and S t. J a n : Off America Hill (in Codium elongatum). 



(About 200 : 1). 



b, cell of the main 



filament with chro- 



matophore and 

 pyrenoid. 



(About 250 : 1). 



These differen- 



21. Chantransia Liagoræ nov. spec. 



Fila vegetativa endophytica inter filamenta assimilatoricis 

 hospitis repentia, parce ramosa, ramis sparsis, ramulis brevibus 

 instructis. 



1) Heydrich, f., Vier neue Florideen von Neu-Seeland (Berichte d. 

 deutschen bot. Gesellschaft, Bd. 11, 1803, p. (78), pl. XXII, flg. 8). 



2) Harvey, W. H., Phycologia Austrahca, vol. V, 1863, p. LVI; compare 

 also J. Agardh Epicrisis, 1876, p. 12. 



