57 



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

 ASKENASY has described the Acroch&tium (Chantransid) 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 (Chantransid) interpositum Heydrich 1 ) 

 must be identical with ASKENASY'S species and is in any case 

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

 rhizum Harv. 2 ), 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 Codium our plant 

 has some likeness also with the Acrochsetium 

 (Callithamnion} Nemalionis 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- 



b, cell of the main 

 filament with chro- 



matophore and 

 pyrenoid. 



(About 250 : 1). 



fied filaments growing widely in the interior of nov.spec. a, filament 

 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. These differen- 

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



21. Chantransia Liagorae 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, 1893, p. (78), pi. XXII, fig. 8). 



2 ) HARVEY, W. H., Phycologia Australica, vol. V, 1863, p. LVI; compare 

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



