F. E. FRITSCH. 



TABLE SHOWING THE COMPOSITION OF THE EPIPHYTIC FLORA ON THE CYANOPHYCEOUS 



SHEETS IN THREE ANTARCTIC PONDS. 



Porid half-way between " Black " and 

 " Brown " Islands. 



Ulothrix subtilis var. varialilis. 

 Pleurococcus antarcticus. 



koettlitzi sp. n. 

 Prasiola (young stages). 

 Dactylococcopsis rhaphidioides. 



Mifrocystis parasitica. 

 Lynybya lagerhrimi. 



attenuata sp. n. 

 Oscillatoria tennis. 

 Calothrix antarctica sp. n. 

 Nostoc sphcvrii-um. 



Nodularia quadrata sp. n. 

 Navicula mitticopsis. 



cymatopleurus. 



shackletoni. 



globiceps. 



Gap Pond, Winter Harbour. 



Ulothrix subtilis var. variabilis. 

 Pleurococcus antarcticus. 



koettlitzi sp. n. 

 Prasiola (young stages). 

 Chroococcus minutus. 



minor. 

 Glteocapsa rupicola. 

 Mierocystis parasitica. 



Lyngbya cvstuarii and var. ant- 

 arctica. 



attemtalft sp. n. 

 (srugineo-cocrulea. 

 Oscillatoria irrigua. 



koettlitzi sp. n. 

 Calothrix intrica/a sp. n. 

 gracilis sp. n. 

 Nostoc disciforme sp. n. 

 longslaffi sp. n. 

 hederulce,. 

 fuscescens sp. n. 

 Anabmia antarctica sp. n. 

 Nodularia spumigena var. minor. 

 Navicula midicopsis. 

 murrayi. 



ffantzschia elongata. 



Pond, Granite Harbour. 



Ulothrix subtilis var. variabilis. 

 Pleurococcus antarcticus. 



Prasiola (young stages). 



Glococapsa rupicola. 

 Mierocystis 2)(irasitica. 

 Microcoleus vaginatus. 

 Lyngbya martensiana. 



scotli sp. n. 

 Oscillatoria tennis. 



Navicula muticopsis. 

 borealis. 

 shackletoni. 



Hantzschia atap&ioxys. 



N. globiceps Greg., N. shackletoni W. and G. S. West, N. cymatopleurus W. and 

 G. S. West, N. borealis Kiitz.), Fragilarias (especially F. tenuicollis Heib. var. 

 antarctica W. and G. S. West) and Plantzschias (H. amphioxys Grun., and H. elongata 

 Grun.), while the other genera appear to be more casual.* Diatoms were rather 

 scantily represented in my material, being common only in two of the samples ; in 

 many habitats they were exceedingly rare. 



In comparison with Arctic regions the scarcity of green Algse is very noticeable 

 (cf. W. and G. S. West, op. cit., p. 265). The publications of Nordstedt f and 

 others have shown that Desmids are relatively abundant in these regions. The 

 other green Algse are well represented, while the Cyanophycese are appreciably 

 less important. Some of the species of Chlamydomonas ( C. caudata Wille,J and 



* Messrs. West also mention the abundant occurrence of Tropidoneis Icevissima W. and G. S. West, in some 

 of the lakes ; I have not met with this form. It should be remarked that abundant fragments of the valves of 

 diverse Centricse were observed in several samples, although intact specimens were rare. 



t Nordstedt, Desmid. ex ins. Spetsbergensibus et Beeren Eiland in expeditionibus ann. 1868 et 1870 suecanis 

 collectse. Ofvers. af Kgl. Vet.-Ak. Forhandl. (1872), Stockholm, No. 6, p. 23 ; Nordstedt, Desmidiefe arctore, op. cit. 

 (1876), No. 6, p. 13. 



| Cf. F. E. Fritsch, op. cit., p. 322. 



